Is my daughter doing everything up to date?

Im 16 and my husband is 19. We have a almost 7 month old child who was born a month early because i had preeclampsia.She can't pull herself up to a sitting up postion but if we sit her up she can stay balanced. She's slept through the night since she was 3 months old and could old her own bottle then too. If we stand her up she can hold on to something and keep herself standing. She can get on her hands and knees but cant crawl yet. Is she supposed to be crawling at this age? She basically just scoots around everywhere lol. Im just wanting to make sure she is doing everything she is supposed to, and find out whats coming up next:)