Question on religion and famiy having problems with sons girlfriend?

My wife and I are 2 different religions, I am Jewish and she is Catholic. We been together for 31 years, from High School. It works for us. I am not religious at all in fact I feel religion separates but I don't force my ideas on anybody.We have a tree at christmas i have been in more Churches then Temples in my life. Last January my son started dating a girl who lives in Upstate Ny. From what I gather her mother is nuts literally, she controls every moves this girl does. She will be 18 this coming November.we live in the Mid-hudson valley area of Ny which is 274 miles door to door from her home. This times she has been down to my home I have driven her both ways because she is afraid to take train. She Came to my Home on Christmas which fell near Hanukkah . My parents have a family get together nothing religious at all. well her mother found out and her true colors came to light. Her mother the devote Catholic wanted to know why did we bring her daughter to a Jewish ritual and we are trying to covert her. Now she cant come back to my home, I hear she is uncomfortable around me my son can only go to her home on her mothers terms. My son says her mother filled this girls head with things about Jews. We her mother might let her come to our home on her Easter recess , I have nothing to say to this girls anymore. My wife feels is not the girls fault because she is from a small Upstate town and she does not know any better. I feel its the 21st century, if she moves out of her town and comes to live in our are she is going to come in contact with Jews African Americans,Latinos and other and how can she be so stupid. I am quite upset about this my wife says I am wrong to be upset its not the girls fault .Who is right here and if the chance this girl come back to my home should I ignore her extiance input would be helpful