My daughter just turned 9 months a few days ago but, I'm concerned she isn't crawling yet and she doesn't pull herself up.

When I go to put her down for tummy time she'll instantly flip out of it and go on her back and look at me like I'm nuts. Idk what to do.

Do I give her time? Or should I be concerned?

Any tips to have to interested in crawling? I put toys out in front of her or next to her and even try to get down and crawl with her. But, she's not having it.