In my home ward, the non-member son of one of the members of the Bishopbric was able to stand up with the Priesthood and hold his baby girl while they gave her baby blessing.
I thought it was beautiful that they included him in the circle, even though he was not a Priesthood holder.
My Buddhist husband likes Mormons and even going to church. He wanted our kids exposed to Christianity for intellectual reasons and likes the community.
If you are worries about her or her family trying to convert you, be honest.
I get to spend my life with someone who was not raised on fear and guilt and strict gender roles.
And, whether she knows it or not she probably does know it but is in denialshe probably sees you as her ticket out of Oldmaidsville. If she won't reason with your investigation of the church, nope on out and go on your merry way.
Early in our relationship, I gave some thought to the question of whether I would ever be willing to marry a non-Mormon. As our relationship has progressed, this vague hypothetical question has led to some much more concrete thinking about what an interfaith marriage would be like for me, for him, and for us.