Baby stopped rolling at 8 months?

Natalie • Married to my high school sweetheart for 3 years. Daughter Noelle born November 3rd, 2018 💗

My daughter started rolling around 7 months, and she rolled many many times from belly to back and back to belly, but then she found out she could sit up on her own and has refused to roll again for a month straight. When I put her on ground and try and encourage her to roll, she throws her body the opposite way so I cannot roll her. We try multiple times a day and still no different. Is this normal? Something I need to talk to the doctor about?