Bismillah
Umm I think the Ayahs were very clear, and I am not telling u what to do but I think discussing the issue was not even recommended. We told her exactly the situation about what she believes, we brought it from Quran in which we believe, follow and adopt. We can only say
To u is your religion and to us ours.
and in another post Insh a Allah I will quote the Ayahs describing how people of the book rejected to believe what they originally had in their own books.
peace