OP, agree with many other posters that you seem not to have appreciated the opportunity your daughter was persuaded to give up, by declining her first offer at Imperial.
Bristol is very good, but the quality of teaching and research at Imperial would have arguably been much better. The cachet of a top-ranking London med school for rest of career also cannot be underestimated - unfair as that is on some levels!
The issue seems clearly that Imperial was her first choice, and she was unable to take this up, having presumably worked bloody hard and achieved the grades.
I understand your POV that you have higher outgoings than some, which limits the student loan available to her.....however, this doesn’t mean you cannot contribute extra funds, really, at top level income bracket?
Even if you choose not do/are unable to do this, it is completely achievable for your daughter to to help self-fund by taking out alternative loans and working part-time. I did this at a similarly prestigious London college twice, as my lovely parents were on minimum wage. I chose to move away from home for the experience and to go the best medical school I had a place at.
First degree full grant and no fees (this was some time ago...!) but still worked as barmaid and cleaner every other weekend and most of hols at home.
Medical degree few years later - no grants, and full loan, but absolutely no parental contribution and full fees to pay. Same bar job for first 2 years with standard uni holidays, and less often during last 3 years. Additional full-time summer hols job in laboratory/auxiliary nursing. 3rd job few hours a week admin at GP surgery during term time.
Self-catering uni accommodation for 3/5 years. Walked everywhere. London has endless free entertainment and cheap food.
There are many funds/ grants available via quite arduous application procedures, which I am still grateful helped me a lot - some specific to Medicine.
I still graduated with considerable debt as London is expensive, and I chose to pay for a world-class elective period abroad. Yes, staying at home would have been cheaper - but let’s face it, if you are concerned about short-term cost, higher education is not a wise choice for anyone these days!
Medics will never be unemployed, and pay is overall good - with greater earning potential from London. I would still make the same decision today.
Perhaps your daughter can transfer to a London college at the end of her second year? Transfers are much more common than they once were, and she/ you will have saved money by being st home for 2 years. She could consider a job now to accumulate some money towards transferring later.
It seems the length of shower may be a (new?) symptom of your daughter’s unhappiness with the situation. FWIW, I love a long shower myself...and would be delighted if this was the only issue with a teen daughter of mine. Hope things can settle down for her.