Sleeping on tummy?

Mickey

My babe will sleep on her back when she lays in bed with us because shes right up on us. Well we have been wanting to get her to sleep in her crib because shes been bedsharing up to this point. Shes in the crib asleep right now but she rolled over from her side to her tummy. Is it okay for her to do that? Id hate to move her to her back and then her wake up.