Tummy time

Is it stil doing good if she doesn’t seem to be even trying to push herself up? She’s either calmly sucking on her hand or freaking out and waving her hands and legs everywhere. I rarely see effort to push herself up and when I do, it seems like she may be behind on the development process. It’s barely 45°, there’s a chance it’s not even 45°. What do I do? She’s almost 3 months old