Baby rolling in crib?!

Rachel

We just transitioned LO to her crib, and she is now proudly rolling on to her stomach and making joyful noises in there. She was sleeping 9-7ish every day and now that she has space she just proudly rolls over and plays. Everything I’m researching only mentions rolling over in sleep and what to do. Any ideas? We put her on her back, but by the time we are back by the monitor she is already rolled onto her tummy and squealing happily.