Hello @boston19, Welcome to Mayo Clinic Connect. I have in highest regard for people who are willing to take in their older relatives at a time when they require assistance.

I'm glad she is not argumentative. That is a blessing n itself.
I was going to suggest maybe using ear plugs with her favorite music. However you have already played music. This is just a thought on my part with no experience. Perhaps her favorite music softly played in the back ground with soft spoken words included on a tape or disc talking over the music that would make feel safe and comfortable repeatedly letting her know where she is and that your there. It's understandable that her short term memory is lacking. However repeated reassurance that everything is good may hel to a certain degree. It's going to be a challenge for sure.
She sounds like she is a sweet lady despite her illness. Hope you find something that works.

Another thing you could try is a baby monitor where you could reply to request for help without having to go back in her room.
Have you thought of anything you would like to try?
There may be some members who may be able to help you accomplish your desire.

Hope This Helps
Errol