It is also considered disrespectful to others, as they may be uncomfortable because of your open displays. Why would you behave any different now. Though my mother never openly complained about this, I could see it in her eyes.
The church is very important to her. On the other hand, if you believe God is bigger than we can imagine, and is not constrained by religious dogma, you have as good a chance as any at a happy, thriving relationship. The Church does not recognize homosexual marriage, and does not condone sexual activity outside of marriage. Read our Exit Stories from Mormonism. He will have to be okay with being thought not good enough to help in circumstances in which you believe that priesthood power is needed. Either way, if you have kids and you don't convert, she will divorce you and take your kids away from you and you will be shunned from her community. She may have served a mission as an ultimatum to herself. I won't lie, there are times I have said to myself "what am I doing living like this. I was the bishops' daughter who went to BYU but didn't go on a mission because I was already married with a 10 month old by my 21st birthday. My family is pretty awesome in the church.