I had a Baptist friend that asked me the usual questions about Catholicism in the guise of just being curious but then during our three week exchange turned the tables and it became apparent she just wanted to attack the Church and Catholicism. I was left feeling quite betrayed by her.
Fast forward to a month ago I met a woman in a store and she is a Baptist. I explained about what happened with my other friend and she was shocked that such an anti-Catholic attitude took place. She explained that not all Baptists are this way and that the preacher is to blame for this. I felt a lot better after speaking with her.
Your Mom should go to RCIA as I feel she would really enjoy the teachings of the Church and put a lot of questions and misconceptions to rest.