L.W.
I'm sorry that you are all having to do this. I've worked in several nursing homes as an Activities Director. She is going to go through a lot of emotions. She is going to feel as if she has lost everything including herself. Don't be surprised if there is anger and resentment. It's part of the adjustment period. I would try to visit her on a regular basis have others do the same. Decorate her room or her side of the room how she would do it. Bring pictures of the family and have them throughout the room. Set up a routine if you can as to when you will visit. They tend to really look forward to those times and get disappointed when they don't happen.
However, one thing I would strongly suggest, is to not have anything of real value in her room. Unfortunately, things are known to come up missing in the homes. Not saying it will happen there but you can never be too sure. A lot of people come and go there so it's a strong possibility. It's a sad thing and very aggravating because a lot of them what they have in their room is all they have left in life. If she has a piece of jewelry she wears all the time, I would suggest replacing it if you can with one that doesn't have any monetary value or sentimental value.
You can probably talk to the social worker on site about what will help make her transition better. Get with the activities department to let them know what her interests are and get involved as much as you can.
And for you, please don't feel guilty. You are doing everything you can for your mom and she loves you for that. You are a wonderful daughter to be looking out for her. It's hard transition not just for her but the entire family. Good luck.