12 month old stopped rolling over?!

My baby has been rolling over since she was 4 months and has slept on belly every since. On Friday the 3rd (12 months) she slept on her back and today the 6th still won’t roll over. She’s did this once a few months ago and it lasted a few days. I lay her on her back and she seems to want to roll over but can’t.

She eats normal crawls tries to walk sleeps her normal 12-14 hrs overnight. Doc appt in a wk so was just wondering if anyone experienced this before with no issues?