Individually-performed, chiefly but not exclusively by women,   dancers move by throwing or thrusting their hips back or shaking their buttocksoften in a low squatting stance. Twerking traces its origins to the West African dance called Mapoukawhich has existed for centuries.
Do not expect anything long term.
If everything she is taught is correct and the Mormon church is "true" she should be able to research any anti-Mormon books or movies and prove their criticisms are lies.
Even if the church believes a bunch of crazy nonsense, and she believes it too, I still really like her and would like to see whether we can have some good intellectual conversations about this stuff.
I say, Follow your heart. I wouldnt encourage my kids to date a mormon.
Discover the joys of a non-sexual relationship and find sincere ways to show affection without sex.