Hi Divya babies can start crawling anywhere between 6 to 10 or even 11 months. in fact, some babies do not even crawl, but simply start sitting up and getting up and walking :) while my first baby did crawl, the second one started getting up and walking without ever crawling. i suggest you give your baby some more time and see how she proceeds with her milestone.
don't worry. babies usually crawl any time between 8 and 11 months. so there is still plenty of time. infact, some babies dont crawl and straight start walking, which happened with my child too. if you are worried, you can start using a toy to encourage your child to come ahead and get it.