In addition to the fact that the cage you're using is significantly too small, it is also way too sparsely planted for a healthy chameleon. There is tons of open space, which will make her stressed out because she lacks places to hide. Moreover, chameleons are arboreal lizards. They need to be as high up as possible to be secure - this means you need to have (specifically) horizontal branches at all elevations in her cage, but especially in the top half. As you have it set up currently, you don't utilize any space in the top half of the enclosure, which is really the critical area. She can't even get close enough to the basking/UVB bulb currently to benefit metabolically. You can attach branches/vines/walkways of your choosing with things like thumb tacs, garden wire, and zip ties.
If you cannot afford to get her a bigger cage ASAP, please consider re-homing her. She will not to do well if major changes are not made in the very near future.