Have you tried Amazon they adore so inexpensive there. That’s where I get all my basking lightls. PetSmart sells the UVB for about $36 for the linear bulb. the whole kit is about $76.
It could be that her temps are too hot. Get a temp gun. They are very inexpensive on Amazon. Then you can check her temperature and her basking area as well her body temperature an range between low 90’s to 104-106