DD will be 10 months in a week and still can't get onto a hands and knees position. I've tried to get her into the position but she lays flat instead. She rolls side to side (does this often) and can roll back to belly and vice versa (but rarely does it). She doesn't move about like a typical 9 month old, E.g. tall kneeling, moving into different positions, though she is very fond of standing and being walked. She needs help and always looks for help with moving about and getting things out of her reach. Tummy time has not really improved since she turned 6 months - it's as if she's just stuck.
All other development is fine. How can I encourage her to move about independently?
I understand some babies don't crawl at all but it's also the lack of being able to do other independent movements which concern me.