This story really touched me.  I'm old and smoked heavily for many years.  I know the feeling of helplessness and hopelessness.  Us older folks don't get around as much, especially if she doesn't have the internet.
So, I saw this from her point of view.  You are a wonderful daughter!  If a relative hadn't done the research for me, I probably never would have tried it myself.  I am forever grateful to my brother for changing my life, as I'm sure your mother is to you.