Oh no op. 💐 I have a nearly 20 year old dd at uni studying law too. This must be your worst nightmare and hers.
I wouldn’t have a clue what to do in this situation tbh, so feel free to ignore what follows, and I know how intransigent teens can be, but I think I might try a two pronged attack:
CAUSALITY : You say your dd has a history of depression. Do you know the cause of this? Has she seen a consultant psychiatrist to be assessed? Is it the issues with her dad that has exacerbated things? Or the end of her relationship with her bf? Or both? Why have things changed so drastically in only a year? Is it drugs?
I think you need to dig deep in to the causes op. If it’s the end of the relationship that has triggered this then she may have an underlying undiagnosed personality disorder? Or adhd?
A lot of undiagnosed mh conditions emerge at uni and she may have been frightened at how unstable she was feeling and sought refuge in temporary comforts. This needs investigating.
Most people take drugs or engage in this risky behaviour in order to block out reality. What is she finding hard to face in her current life? Did something happen in her history to trigger this?
INTERVENTION: I think in your shoes I would try and ask for compassionate leave from my job, get my entire family on board (support for her and you) and take your dd away to a holiday cottage for two weeks at the other end of the country. Or if I couldn’t afford that, beg friends or family for accommodation elsewhere. And go for long walks, really talk to her. Tell her you love her too much for her to carry on living this way and doing damage to herself.
Feed her nutritious food. Get her back in to a good pattern of eating and sleeping and exercising. (I know this sounds far too simplistic but once those three bodily things are in place people usually feel a lot better in their minds.)
But most importantly of all, try and really connect with her. It will take a lot of effort on your part to put the past difficulties in your relationship out of your mind (it’s understandable if you feel anger at the way she has blown off her uni opportunities but that’s in the past now and your daughter is in serious trouble).
Both of the above strategies take time and money and I have no idea of course how you would persuade her to participate in either. That will be the hardest part. But given the severity of what is happening I think it’s worth trying to pull her out of it and giving her a real “shock” to the system and facilitate an opportunity where she can stop and think. And if it doesn’t work at least you - and she - will know that you have given it your very best. And she will know she is loved enough that you tried. And sometimes it’s just the “knowing that you are loved” bit that gets people through these situations.
I don’t know if any of that is of any use at all op. It’s such a daunting situation. I think you need professional help though. Psychiatrists, a drugs counsellor, family, friends. Don’t try and struggle on your own. Good luck.