S.L.
Don't worry! This just means she will have healthier teeth when they do come in. My neice didn't get any teeth until after she was a year old and her dad (my brother) was the same way. He never had a cavity until he was in his teens. All 3 of my girls had at least 2 teeth by the time they were 9 months old. 2 of them were under 6 months but that is average.
Save you worries girl. you'll need them later.lol