Thats great that it is keeping her from rolling over, it is obviously a concern for you that she mushes her face into the bed. I remember the first time Evan rolled over in his sleep, I freaked out and rolled him back on to his back, only to wake again with him on his belly. Was a hard adjustment to get use to but he seemed to prefer it that way. I figured if he could roll over on his own was reasonably safe. Was much longer after that he could roll back anyway.