Aside from being on the young sign, from my experience, she should be fine. My son (6) recently lost his first two bottom teeth - about a month after the adult teeth started growing in behind. I was freaked out, but the dentist kept telling me not to worry, that they would come out. And they did. When I saw him for my son's appointment a few weeks later, he said the concern starts when the adult teeth are completely in but the baby teeth barely lose.
We were told to teach our son how to wiggle his teeth, and give him lots of crunchy foods - apples, carrots, pretzels, that sort of stuff. Take a deep breath, and then don't think about it for three weeks. If the teeth still haven't fallen out and aren't on the verge on it, make an appointment.
*Note: I am not a dentist and this is not a substitution for consulting one.*