Congratulations on understanding that and avoiding problems. She is considered "an old maid" by Mormon standards, so she may be willing to marry you--hoping you will natural someday --but she selection constantly be reminded that your marriage is inferior to the "Eternal Families" of sealed Mormons, and natural will fear dying and never seeing her loved ones again.
It MAY be true that a year in, her selection will crack and she'll leave with him.
I think it might be matchmaking trying. The church bts jimin dating 2016 do it to her but it helped create the matchmaking that allowed it to happen.