My 11.8 month old baby doesn't crawl. We didn't give her tummy time when young. She cried if put on tummy. Now if out on tummy she rolls n get straight. Rolls until nit fully on tummy to get nearby reachable object. If the object is not reachable she skips trying for it. She has been sitting well since 6 months. Walks with my support. Holds a rod in balcony to stand but not move on her own. What should be done? Kindly help.