VioletSky
I am sorry but you don't sound very sympathetic. You know your daughter is having mental health issues but you arent respecting her feelings at all.
You say you want her out of this abusive relationship but then you make her unwelcome in your home which should be a safe space and talk about everything you do for her as if that comes with strings attached, when that should just come naturally.
The types of help you could get her are suppott with counselling, support to regain financial independance and her own place support to rebuild her life in a way that doesnt leave her trapped between two sitiations where she can only be unhappy with him or unhappy with you.
To me, you are the unsympathetic one, not OP.
She has just had a knee replacement done, and her daughter came to stay, purportedly to help her mother.
No one said a word about the daughter having mental ailments of any kind.
What is wrong with her is that she cannot decide whether to leave her husband, or to stay with him, even although she finds him abusive.
GramaJ: tell your daughter that you love her, but she cannot go on like this and run home to you every blessed time things go wrong at home. Either she does something, like kicking her husband's backside, or her own, or demanding a divorce on grounds of incompatiility or mental crueltly or anything else that can be proved, or she trys wholeheartedly to make her marriage work.
I don't know, and neither do you apparently, why she stays with this man, but that is her lookout and the decision to stay or leave him is hers to take too. Tell her nicely that if she is leaving her husband, she will need to find a place to stay, because she cannot live with you. It just does not work, does it?