Hello Buddha
When my husband first went into residential care I really didn`t want him to sit in his room all alone so asked the care staff to make sure his room was only for sleeping or if he was ill.
To that end, and to try to ensure he felt at home with the other residents, I made an effort to make friends with them, I greeted them when I visited and made sure I learnt their names.
My husband settled well and always looked as comfortable as if he was in his own home. I left my coat in his room so he never saw me in outdoor clothes. I had little problems when I left after a visit. I usually made excuses, I was going shopping or to get the washing in, activities he was familiar with me doing.
If you possibly can, try to see visiting from your mother`s perspective. You want her to settle and be contented when you are not there.
You have cared for her for a long time and the transition will be difficult for you and painful too I imagine. If you can think long term it might be easier for you. The other residents are now your mother`s housemates so if she sees you interacting with them, only in a gentle way, it will help your mother feel more at home.