Rolling and frustrated during sleep, help!

My 6mo has been rolling back to belly for about a month, although strangely enough, typically only while in her crib. Anyway, she seems to prefer side sleeping but the problem is she often turns too hard, and fully rolls to her belly. She will eventually wake up mad because she’s stuck and can’t roll to her back. I’ll go and reposition her for her to immediately do it again! At this point she’s awake and immediately pissed. Rinse and repeat. Any words of wisdom, how long it took your baby to master rolling belly to back? My first never did this. SOS, I’m exhausted!