Hello, and welcome to the forum!
Like Alissa and Julie's kiddos, my daughter was also very late with the physical milestones. She was born at 29 weeks, did not crawl until 14 months, and did not walk until 21-22 months. She was in PT for about a year, and eventually picked up everything just fine - just much later than most other kids. At the time, naturally, it was stressful and I worried that she would always be behind. She is now a happy, healthy 6 year old, who is in soccer and gymnastics. She is still very small for her age, so she doesn't run quite as fast as the others in soccer, and isn't quite as coordinated as some of the girls in gymnastics, but she doesn't notice in the slightest and loves every minute of it.
These little ones have been through so much already, it's not uncommon for them to have some delays. Try to not to worry too much about it - easier said then done, I know! If she continues progressing slowly, you could discuss with your doctor the possibility of getting her into physical therapy.