I'm going INSANE

My daughter is almost 5 months and has been sleeping all night in her crib since 3 1/2 months. If she woke up, she would only fuss for a minute then fall back asleep. WELL, recently she's started rolling over, back to stomach. Ever since, I lay her on her back in her crib, she falls asleep, does okay for about an hour IF that, then starts to roll over, wakes up and cries because she cant roll back on her back. I go in her room and put her on her back AT LEAST 20 times throughout the night. Send help.😭😴