I am so sorry to hear this.
It is really tough to have to watch our loved ones deteriorate.
What is even tougher (especially when it involves a family member), is relinquishing control of their welfare to strangers.
Especially when it seems to be the only bit of control we have at all.
It sure does suck, doesn't it?
However, on a positive note, you need to know that your Mom is getting the very best in medical care now.
Being attended to by a team of professionals 24/7, she will have no more opportunity to drink or otherwise derail her health.
This can only be a good thing for her.
Try to rest, and just take each new day as it comes.