Is there any legal arrangement that can be put in place to protect or limit my filial responsibility to my mother.

We prepared our house extensively for the day when my mother (89) needed to move from her apartment and we oversee her care. She reached that point two years ago when she was not taking her medications and failing to take care of herself. We moved her from DE to VA to get her back on her feet. She does not get along with my wife and has been very difficult to live with. She has refused to sell her condo and has spent between $35 and $40K maintaining it in an empty state. She is not wealthy and I have told her that it is important to get her affairs in order to support her medical or living needs if she becomes less self sufficient. She wants to move back to live by herself which I believe would be negligent on my part if I supported moving her away from our care. What are my options to protect her and my wife and I from financial impact.