another thought -
does she want this for herself or to give someone else as a gift?
if it's for herself, by all means, it should come back to you eventually, whatever you agree to now.
when my mother died, my sister and i each got the gifts we had given her.
there were also things she 'ordered' from each of us, and those also came back. they were either given or made with love, and she would have wanted us to have them back. in my case, those things have been shared by my own children who loved her, and now have keepsakes.