Since your baby was born at 33 weeks, her corrected age is closer to about 8-9 months, so teeth coming in later than full-term babies is quite expected and not unusual at all. That said, given her prematurity and the fact that teething signs are there but no teeth yet, it would be worth bringing it up with her PD at the next visit just to get a professional opinion and put your mind at ease. Family history of late teething like yours is also a real factor, so there may be nothing to worry about, but having the PD take a look is the safest way to be sure.