I think it's ok to talk to your mom about your spiritual beliefs, but you shouldn't try to make her change.
The real question is whether she is happy and comfortable with her current beliefs. If she is unhappy, then you and your other family members can be living examples of what a positive belief system can create in a person's life. If she's miserable or annoyed all the time, then just by looking at your life, she can see what being in a state of peace and abundance looks like.
I don't think we can make people change, but we can definitely influence them to change on their own.
