cakehunter I am so sorry. She is so lucky to have you. I could not talk to my mother about my husband's cruelty, which was very subtle and mental more than physical and kept me in utter misery.
I have mentioned this before, but do not want to get it out of perspective, obviously not knowing the circumstances, but the internet can help. I learned that I was not being treated humanely simply when I read something on the internet for example!
Just now, I simply typed in "How can you find out if a relationship is toxic?" and the first result was:
time.com/5274206/toxic-relationship-signs-help/
and it said:
"The first (sign), and simplest, is persistent unhappiness, Glass says. If a relationship stops bringing joy, and instead consistently makes you feel sad, angry, anxious or “resigned, like you’ve sold out,” it may be toxic, Glass says. You may also find yourself envious of happy couples."
I thought this sounded a bit like your daughter but of course I do not know.
I noticed how scared I was when I loaded the dishwasher when my husband was away and put something where he didn't like it to go. I leaned in to move it and realised I would be the one to empty this load! He wouldn't know! I literally felt my shoulders go down as if several inches and my tension go out of me. I suddenly realised I spent all my life carrying this tension of fear, terror of upsetting him and had become so used to it that I did not know I had it!
There are other good pieces of advice about how you should ask people to treat you, on You Tube, despite people's fear of the "mad" stuff! Many of the contributors are professionals, mostly from America where talking about feelings seems more open.
I tried putting "how to decide when a marriage should end" in the YT ?line and there seem to be some which you (not your daughter until you screen them I think) might be able to see and decide if they give any guidelines. You'll know within seconds, well minutes, if that person's approach is not for you! I, for example, avoid Jordan Peterson like the plague - but he's a well-known crazy man. "Clever" maybe, but people in his subject area, which is Psychology, do not necessarily value him - he was fired for example from one prestigious university.
I like Stephanie Lyn Coaching. She has a talk about setting your Boundaries and says some of us do not even know what our boundaries are because we do not value ourselves enough to ask/show people how we expect them to treat us. She has so many videos as she makes one a week, with a link for people to send email messages as it goes on. There is one which might clarify some issues called "What is Emotional Abuse?...." and explains about whether a person feels validated or respected. In case it should be relevant try:
"What makes the COVERT Narcissist So Dangerous!..." and/or the one by Dr Craig Malkin "What's the single greatest danger of covert narcissism?" - I mention these Covert Narc. ones because it is so difficult to describe or even realise it is happening. Dr Malkin says somewhere (poss in another talk) that partners get so used to being abused they do not recognise it is abuse.
If your daughter's husband has eroded her self-esteem and is treating her in other ways that make her very unhappy, look at signs for "covert narcissism". These people are the pillars of the community on the outside but indoors they make the life of their spouse an imprisoned torture through, mostly, mental torture which is very hard for her to explain to others. Try getting her to simply talk. To talk about her day at home. What she did from waking up, let her ramble on and encourage the details.
Ideally your daughter might well benefit from counselling if she can find someone suitable, for her on her own at least at this stage. It sounds as if she is very unhappy and possibly depressed. Talking to someone made me realise that I was putting up with unreasonable behaviour. But finding a good Counsellor is not easy and can take time.
I truly hope your daughter is not going through serious problems such as those I have mentioned. However, please take her unhappiness seriously. Try not to say "We just put up with things" in case this closes her down when she might be trying to address something bigger or something she has trouble putting into words or even understanding. Try and deduce whether the couple talk things over and how that goes - is it a fair and even give and take? But again do not ask too directly, or be in any way looking as if you are setting up a "this is what you should do" scenario. Remember, when talking about our unhappiness we often play it down especially when talking to a person whom we love.
I do think a Counsellor with a professional viewpoint, who is outside the situation would be of great help. If you don't find the right match with a Counsellor first time, do try again. It is simply a matter that different people suit different people! Meanwhile, be a good listener, a "sounding board" and learn as best you can what is actually happening. Help her learn what is right and wrong to expect in a healthy relationship and stand by her as she figures out what to do. She must be feeling very distressed. I am glad she has you. Much love 