New obsessive behavior

My 94 yr old mom with dementia has always enjoyed listening to music, especially the music of her youth. She sings along often, remembering the lyrics. I have searched for and found about 25 CDs of very old music that she enjoys. In the last couple of months, she has started clapping with the music instead of singing. It has gotten obsessive where she claps nonstop and claps really hard, often getting herself overheated. No one is allowed to talk to her while she’s clapping. She gets very angry if interrupted. I don’t know if I should try to stop the crazy clapping or just let her do it. She doesn’t have much enjoyment besides music because she is legally blind and cannot see the TV. She can only rarely carry on a conversation. She enjoys eating but otherwise, she has little to occupy her besides music. It just seems the clapping is more like work than enjoyment for her. I’m not sure what she thinks she is accomplishing with the clapping, but it clearly isn’t enjoyment. It isn’t with the beat and she continues clapping even in between songs. Maybe I’m worrying for nothing. I do have caregivers that come 5 days a week for 4 hours who play games with my mom and have her do easy puzzles, etc. but if my mom asks for music, then the clapping starts and the caregiver isn’t “allowed” to interrupt her.