All of a sudden.. 5 month old is getting stuck on belly!

Michelle • Baby 💗 born 6/11/17 & 💗 born 8/27/19

My baby girl rolled belly to back at 10 weeks old.. no problem. She started rolling back to belly about a month ago. Now she can’t figure out how to get to her back once she’s on her belly. She gets SO frustrated and puts her arms out to her side and looks like a beached whale.. haha. I try to help her figure it out but she just can’t. What the heck?! Anyone else have the same problem?