People can give you stab in the dark guesses but without actually seeing what you describe it could be 100% normal or it could be a huge problem like MBD of a neurological issue. If you can capture what you're talking about on video or something and post it folks might be able to help a bit but my advice would be that if it worries you that much you should get her to a vet. Arav.org is a great website to find one near you.
If it is MBD the best course of action depends on how severe it is. If it's really mild increasing calcium intake by dusting every meal and leaving a calcium dish in the cage (good idea always anyhow) might correct it. If it's worse that mild you probably need to consult a vet for more efficient ways of getting calcium into your geckos system. This could include shots or additional liquid supplements. Again, you could just be seeing something that is totally normal and just looks funny to you. I can't say without seeing what it is you're describing.