When to be concerned?

My daughter just turned seven months.

She still does not roll from her back to her belly every time I try to help her she just tries to roll back. She thinks whenever she’s on her stomach she is supposed to just roll over. I try to get her to stay on her belly and to put weight on her arms and instead she rather put her hands in her mouth. I’ve tried using toys but that doesn’t seem to do much difference. How can I help her. When she’s in sitting position she tries to reach out as if she’s wanting to get into the crawling position but whenever I try to help her she thinks if she’s on her belly she should automatically roll over.

I want to help her to crawl because it seems like she wants to, but if she won’t put any weight on her arms or lay on her belly, how can I do that?

Sorry if that sounds all over the place 😂