Not rolling over 7 months


Daughter is 7 months has rolled from front to back twice, only rolls back to front if she's awake in her cot and refusing a nap as she hooks her feet on to the bars to play and pushes herself over. I've tried absolutely everything, loads of tummy time, playing and moving objects so she can reach over for them and she's just not interested. She sits up so well, has done for about 2 months, loves sitting up and eats her food well and likes to look around and play. Basically if shes awake shes sitting up playing and grabbing things. I feel like maybe because she's sitting now she has no interest in laying down maybe? I'm not sure. Should I contact her Dr?