Can you sit with whoever is her primary carer there and ask to see her care plan, risk assessments and notes.
Ask what they have in place to allow your Mum the maximum amount of control over what she can and cannot do.
I feel so much for you both. I am currently in a rehab unit following a simple knee replacement and the lack of freedom and choice makes me feel like a prisioner.
Even daft things, like the coffee I drink, the pillows supplied, the meal times, the food.
Add to that being forced to live with a bunch of strangers in a strange place, with none of my 'stuff' around me, no ability to make myself a cheese sandwich. It's awful and I've cried every day.
Don't beat yourself up about this. The system is an unfeeling monster that takes the dignity and humanity away from people when they are at their most vulnerable. it stinks.
My one piece of advice is to talk, but also to write, ensure there are notes on her file that they will have to comply with. Conversations easily get 'forgotten' a paper/email trail is impossible to lose.Write down a summary of any discusssion, plus a list of Mums likes and dislikes. Is she introverted? Does she have favorite foods, foods she can't stand, tv programmes? Is her continence ok ? Has she a mobile? You know your mum better than anyone, so make sure the staff know the little things that can turn a day from just about bearable to feeling helpless. that would be a real help for her, and the staff. Good luck
You sound like an amazing daughter.