tummy sleeper

Hi mommas need some advice to ease my mind...my 5 month old  sleeps fine but rolls over constantly onto her tummy...last night she was sleeping on her tummy and I rolled her over on her back and woke her up:( UGH! lol she has great head control but IDK a why I can't sleep at ease knowing she is face down...what should I do?? Should I let her sleep on her tummy? Thank you!