@Chamberlain
Have you been able to discuss this issue with the Ward Sister of the ward where your Mother is a patient? I ask because quite often, unless specifically had it pointed out to them, the discharge is without fully appreciating the situation they are discharging your Mother too. In my experience, patients themselves have been adamant they will be absloutely fin, able to manage perfectly well etc but, when discussing with a relative it will appear that the patient is just not being realistic at all, or the patient just says all that in order to get out of hospital.
There is often a Discharge Liaison Nurse, for the whole hospital, or was when I was working last, and it would be this Nurse who would be worth arranging to see, in my opinion. Personally, in your shoes, I would be making sure that every member of staff I spoke to, plus those I made sure I spoke to, had a full understanding of the situation AND your very relevant experiences following previous discharges and apt concerns, including how it is affecting your studies and potentially your future
Good luck and I do hope you can get a good, and planned, discharged with appropriate backup. I would feel it was important that your Mother had at least two visits a day from carers, arranged by the hospital. Be assured you have a lot of support for your situation on here. Fight for it from the hospital too, eh?
All the best, eh?