Reply to Rolling over

Try placing her on her side so she can try half way. Maybe she’ll figure it out. My son was the opposite and rolled from tummy to back by 3 month but by 4 was still not close to rolling from back to tummy. We did this and 2 weeks later he rolled all the way over. It might also be that she’s just not motivated. using a hanging toy or something she has to reach up for might interest her in getting over.