sleep problems + crawling

Charlotte • 21/9/16💗👶🏻
Hey I don't know if anyone else is having the same problem? My little girl has been a great sleeper from day 1 recently she's started crawling (well belly shuffling) and the past couple of night she just won't settle it takes about 3 hours to settle her at night time where she used to fall asleep straight away...any advice?