What kind of mothers day gift is appropriate for a grieving mother?

My grandma's best friend and a good friend of the family lost her daughter like 6 months ago. Her daughter was like in her fifties and just died in her sleep. :( I want to get her a nice gift that is appropriate and that she wil like. She is having a really hard time with the grieving. If this helps she is in her seventies and used to own a flower shop so maybe something that has to do with flowers but that will last forever?