Keeping the communication lines open is the most important thing. Frankly your daughter could do a lot worse than ally herself with LDS people. They are generally a pretty good lot. The upside is you might get lots of grand kids out of it.
(Though you might want to let slip to your daughter that LDS men are allowed more than one wife in the hereafter and if she were to marry one she might have to share him. )
"Any over-ritualized religion since the dawn of time can make its priests say yes, we know, it is rotten, and hard luck, but just do as we say, keep at the ritual, stick it out, give us your money and you'll end up with the angels in heaven for evermore."
Chances are good that any new member will become disillusioned with the church within the first two years and drop out (that's the case for the majority of converts), unless, of course, she marries a long-time member.
"The DNA of fictional populations appears to be the most susceptible to extinction." - Simon Southerton