Hello all 
I've been reading posts here for some time - never thought I would have a reason to post on this topic from personal experience...but am here now looking for advice.
I'll try to keep this as short as possible!!
I have 2 DD's, 25 and 19. My 25 year old lives with her SO and lives her life happily and I am happy for her.
However, my 19 year old DD graduated high school (in Canada we live) and has had a part-time job in retail since 16 while in school. She is very mature for the most part (minus all the dishes that go missing in her room and water bottles...what is with that with teen's anyways??) and respectful, also for the most part.
I have been married for 10 years to their SF and there have been issues at times but nothing horrible. I will say my husband and I are stricter and have higher expectations of how a family lives and gets along than their father and are firm believers in looking out for one another and respectful of each others space and time and have taught them to keep an eye open to help out if something needs doing..ie if you take the last or even 3rd last water, coke, etc. put some back from the box for the next guy..thinking of others simply put.
Just over a year ago DD (19) met a boy and started dating, first serious relationship. Prior to that she was always social with friends in the past, always busy busy but still somewhat around but always rushing when home because she burns the candle at both ends. She had plans for college but wanted to take some time off in between to work, save money etc.
We gave her my old vehicle to use as her own whenever she wanted, she only had to put her own fuel in and pay $70.00 towards insurance to give her some responsibility.
In the past year, she has only had her bf to our home twice. We have suggested having him over for dinner but she always had a reason as to why that wouldn't work. I only work part-time and am always home, her bf's parents work and are never home so she is there ALL her free time. We saw this happening and said we would like to get to know him to no avail. We're pretty cool parents and DD's could always talk to me about anything.
DD talked to me over time about her bf and the family dynamic in his home. Parents are drinkers and fight at times, bf's father and bf don't have a great relationship. Turns out bf is on alot of meds for anxiety and depression ( I found the names written down on a piece of paper and they are legit serious meds) and bf's mom has leaned on her son alot through her marital troubles. DD came home one day saying bf and his father had an argument that made his mother cry so the father punched a hole in bf's bedroom door - while she was in there with bf trying to calm him down!!
I have suggested maybe her being there all the time is not helping the situation and that she really isn't qualified nor should she be at this age taking on all his problems/issues. Hard to tell someone tho when they're in deep. But she would often tell me stories but that was the only one where I heard of violence and I tried to remain non judgemental at all times but was clear that violence is wrong in that instance.
FF to a month ago. My H told DD to please make time to be home on the weekend so he could do an oil change and change the tires on the vehicle we had given her to use, this went on for a month and she just wouldn't take time away from her bf to be here. Her curfew was 2 am, fair enough I think for 19 yrs old and driving around in my old car, but I put my foot down on sleeping at his house and said only if they were going to be having drinks with friends...part of it was since they spend so much time together, she stopped talking college and wasn't looking for full-time work, I didn't want her getting into the habit of being with him 24 hrs a day...he still was in high school for 1 more year.
1 month went by of weekends and she wouldn't take time for her SF to work on the car, I warned her we would take the keys if she didn't take the time and we did, that was a month ago and I have seen her for 2 mins after I had to wait to catch her on the street outside his house and spoke to her once over the phone 2 weeks after she left.
She won't take my calls, answer my texts. I went to his house with my H and spent an hour talking in the yard with his P's...they told us they had just been discussing earlier that day how they don't think she's gone home the past week and should they start charging her rent!!
We were like we don't know about you but we hope our D goes on to college etc. and we do have rules and no we don't want her sleeping here and getting too comfortable and the answer was she's 19 right? Yes, and yes there's not a damn thing I can do.
When she finally talked to me on the phone which was days after that meeting I find out that I am not the reason she isn't coming home, it's her SF, he's mean. Are you kidding me?? And bf's parents only want her to buy her own food.
I tried to reason with her, remind her how she has no vehicle now, to think about how making such a decision would affect her future with school and how much harder it would be and I called her out about her SF because he has been good to her, loved her like his own but he is no pushover.
It has been 5 weeks she's been gone, I'm not hounding her, I texted her 6 days ago tho saying I can't believe she is treating me like I no longer exist, that she has a right to be happy but so do I so at least acknowledge in some way - any way, but she is completely ignoring me.
I automatically want to blame bf and his p's but DD is stubborn and headstrong however I believe they have welcomed her with open arms and made her comfortable and maybe everyones a little happier with her around (for now) because she tempers the dynamic and is good for their boy grrrrr....just my suspicion. But I am very worried as this bf is on some serious anti-psychotic meds, I don't know him, and his parents are pretty liberal...found out when meeting bf's parents bf likes his pot alot!! And he doesn't work...so I assume my DD has been paying for everything they do including eating out.
DD never came home to get clothes or anything since, just has what she has left there over time.
I am at a loss over all this and my other DD is in shock and has tried to talk to her sister but she ignores her as well...our friends and family cannot believe she has done this and is blaming SF. He and I believe it's an excuse to do as she pleases because we have rules.
Thoughts? Suggestions?? At this point I've stepped back but let her know her home is always here but with how she's treating me I'm ready to void that option.