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.
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