Most couples who are married where one is a Mormon and the other isn't, usually stems from a situation where they both were married in the temple, then one of them lost their faith sometime after that.
I let her know I'd been reading on LDS. Take issues as they arise, rather than throwing away what could be a good experience for you and her based off of what might happen. Maybe it won't be a big ror. It's not fair to put words in her mouth and thoughts in her brain like this.