So my daughter sleeps on her stomach (has been since 6 months) and it's the only way she'll fall…

So my daughter sleeps on her stomach (has been since 6 months) and it's the only way she'll fall asleep. She's trying to stand now (going to move the crib down more) and I'm tired of bending over for at least 15 minutes every night to make sure she goes to sleep. Is there anything I can do to make her fall asleep on her own? If she happens to wake up crying, we just let her cry it out and that seems to work.