Is it bad if a 15-year-old girl's hips are uneven if she is still growing?

Uneven hips are indicative of spinal curvature. This needs to be fixed while the girl is growing (between the ages of 13-16). You should see a doctor if you have noticed your hips are at different levels.

While seeing a doctor is always advisable if you have health concerns you shouldn't be too alarmed. Uneven hips could simply be a result of having one leg slightly longer than the other which is very common.