How is her breathing now, has it gotten any better?
Which UVB light were you able to find at the local pet store? You may need to try & order
one online because a lot of the pet stores simply don't carry many UVB lights.,
How did you find out she has parasites if she hasn't gone to a vet yet?
What is the temp at the spot she likes to bask the most? A surface temp of 123 is way too hot and could be making her dehydrated. If the surface temps are too hot for her to bask correctly it could also be causing her to not be getting enough uvb. Both of those things could be making her weak and not want to eat.