She sounds like my DD Kate, didn't crawl till AFTER she could walk, and then it was kind of a half-sitting crab crawl - just to get to the wall so she could stand up and walk. I got stressed about that whole issue too, but I figured she crawled after she walked so that's fine isn't it? And now I see people saying that crawling isn't even a milestone
Don't sweat it babe, she sounds like she's going great guns