I would go with a small cuddle quilt now and in giving it to her tell her that if she would like it you could make a memory quilt. That way if she is the one to go thru her mother's things, she could save anything that would have special meaning. If she has a negative reaction, just drop it. That way there is no sense in going to all that work if she has no desire for it but knows that you are thoughtful enough to be willing to make one for her if she would want it.