As someone quite eloquently said once on this board (i am sorry I do not remember who to give credit to), and I borrowed the statement and put it on my facebook because it was so poignant---
You cannot choose what you believe. Belief is not like a switch that you can choose to turn off or on.
You believe what you believe until something comes along to influence that belief enough to change it.
So until something rocks your mom's world, or it influences her enough, she won't change her beliefs because she is not searching to.