11 week old still not lifting head on tummy

Nikole
My bub is 11 weeks and still not lofted her head at tummy time which she hates anyway. I'm worried also cuz she sleeps in a rock n play and I heard that can hinder their head lifting. Is this normal? Are you almost 3 mo Olds just putting their head to the side? She lifts her head on my lap and when holding her real well. Just need some input!