In my professional life as a teacher of the pupils in their late teens I have seen a lot of situations like yours, and I think you may be able to prevent the estrangement you feel threatened by if you act now.
First, stop nagging your daughter to get off her phone and study. Doing so is obviously not working. And it won't. No teenager (and very few adults) has ever stopped doing anything because they were nagged.
You have made your point to her, now leave it to her teachers to follow it up, if the time she spends on her phone or on anything else is affecting her studies.
You can ask her teacher for a progress report if you are seriously concerned about how she is doing in school.
Next point; Find an adult whom you honestly can discuss the problems confronting you that have no relation to your children, plus the situation between you and the children's father and grandmother.
No child of divorced parents should be forced to listen to one parent complaining about the other, or about a grandmother whom they are fond of.
Nor can you reasonably expect teenagers to be interested in, or have the experience to comment usefully upon the other problems you mention. You are concerned about these and find them wearying, but you need a contempory to discuss them with, not your children.
It is fine telling the children something along the lines of, "I am worried about our neighbours' attitude." but please don't expect or demand that your children know what to do about it.
I am sorry if I sound harsh, but my life is hard too, right now.
Now is the time for you to start letting go of your babies by realising they are nearly grown up and instead of regretting this, beginning to think of what you want to do with your time.
If you feel mentally fragile, go and get professional help.
Then when you feel stronger, engage more in your work, and less in your children's affairs. Now is the time to start letting them do their own washing, cooking an evening meal once or twice a week, balancing their own budget for phone, travel expenses and so on, so when they leave home they can cope, and you know what you are going to do the day they move out.
If you can avoid being the over-protective mum now, you will be able to establish a good relationship to your adult chidren, even if the road through their adolesence is hard at time. It is a hard road to travel.