My mom is in a ALF and is very introverted and not socializing. What are some ways to move this along?

My mother-in-law also has dementia and was basically forced into asst living about a year after my father-in-law died, and she fell and broke her hip. She was NOT happy, but eventually she's stopped crying about 'going home'. She also is not a social person. She told me years ago that all she needed was her family, not friends. Now she's paying the price I'm afraid by only having us to entertain her. At first she didn't leave her room except to eat, and walk with the walker that I blinged up for her. Now she does sit and listen to music and other people talking though. One of the other problems she has is that she is legally blind because of macular degeneration. She can't see peoples faces so she doesn't recognize anyone except the ladies at her table. Plus now with the memory of a gnat, she couldn't remember them anyway. Since I'm the one that spends most of the time with her, I had to start leaving her alone for a few days at a time. What was the point of her venturing out of her little hidey hole if she knew I was going to be there to take her out constantly? She and I do spend two or three days a week together though, which means the whole day usually. But if I can't get over there for whatever reason, she makes the effort to get out of her room because she knows she HAS to. Also, I talked to the activities director about making sure someone personally invited/escorted her to activities, which has helped. It's a terrible thing to have to be yanked out of the house she lived in for 50 years. I get it.