M.F.
What a caring mommie you are! Your baby will learn soon how to roll the rest of the way. In the mean time, just make sure there is nothing overly soft or anywhere she can roll that would cause a smothering risk. That means no pillows in the crib with her and if you have a bumper pad around the sides of the crib, take it out. She will be ok!
Mommie, you need some sleep! If it makes you feel better, set your alarm to go check on her once or twice a night, but that is up to you!
God Bless you, and your little one!