Unable to test 102 yo grandma

Hello everyone. My only grandparent that is still alive is my 102 years old grandmother. She lives in a nursing home because she suffers from advanced dementia. She cannot consent to or understand the concept of doing the ancestry dna test. So it is not really a possibility.

I struggle with the fact that she is still alive and she would be able to guide me in a direction with her results. So it is kind of a missed opportunity if you get me. Because I have so many unanswered questions about our past.

I just wanted to get this off my chest and was wondering if anyone else has been in this situation. Maybe anyone else has advice how to deal with this? Thanks in advance.

Edit: I forgot to add that we have talked about the subject when she was still healthy and she was always against it. Not once but everytime. She was pretty secretive about where she comes from. Also I dont have uncles, aunts or cousins.

P.S. I just wanted to clearify that I am NOT testing my grandmother. I just wanted to know if other people went through this and how they deal with the feeling of a lost opportunity.