R.M.
Hi there,
This will pass. My son did the same thing. You will see that very soon she will learn how to roll back over on her own. My son is all over the crib now. You just have to ride it out and it will pass.
I would suggest NOT to use the sleep positioner. In fact, it is recommended that as soon as babies roll over that it can suffocate them. So, please don't use it, she will roll over with it.
You'll find once she gets past this stage, something else will pop up. My son is 9 months old and is crawling and wakes up 4-5 times in the night screaming sitting up in his crib :( I just go and lay him down and hope this stage, like the other, passes soon.
Good luck and it will pass and you'll get some rest!