My sister moved into IL in December. She agreed she was no longer safe at home. Now she won’t leave her room! Should I be concerned?

She really would have preferred to stay at home, but repeated trips to the ER after falls finally convinced her. But she hasn’t left her room since she moved in. Says the planned activities aren’t interesting. Hasn’t gone to the dining room, has all her meals delivered to her room. She sleeps most of the time. She had mobility issues before the move (pain walking, used cane, walker or scooter) but it is getting much worse and now she can barely make it to the door and she is in a studio. She has med manager telling her she needs to walk, as well as her doctor and family. It’s like she has given up and is just waiting to die. She has mild dementia with hallucinations and delusions. Not bad enough for memory care, but we are now trying to figure out if she should be in AL. Cost of care would basically double. So far I have been paying majority of her expenses until her house sells, (closing is the end of this month) at which point I will be reimbursed. But with the added cost of AL, her assets will only last her about 2 1/2 years. And she makes too much for Medicaid. Not really sure what you can tell me. Just concerned about her lack of will to survive. And she is on antidepressants.