Poor little love. I'm so glad you found this forum, there are a lot of knowledgeable people on here who can help you out. Unfortunately, there are some things with her care that do need to change immediately. Chameleons come from many different places and will need different care requirements (temps, humidity, supplementation schedule etc). I am not familiar with your chameleons care but I can help you with what I do know:
UVB - unfortunately your baby girl does not have the proper UVB, this is needed in combination for proper bone and muscle development. Without proper UVB, calcium and vitamin D3 her bones will be come soft and rubbery and will break easily. If she is an egg laying chameleon, she will also need this for proper development of eggs. The proper UVB is a T5HO Arcadia 6% or Reptisun 5.0. I'll link what you need for this below:
UVB hood
Arcadia or
Reptisun
Enclosure size - she will need a 2ftx2ftx4ft enclosure, this is the minimum requirement size for most chameleons
Supplementation - she needs phosphorus free calcium with out vitamin D3 dusted on every feeding. She also needs multivitamins and D3, I like to use
Repashy LoD which is both of those things combined. Some chameleons need this supplement 2x a month, others need it once a month so this is something we will have to look into.
Egg Laying - she looks a little plumb in her belly area, if she is an egg laying chameleon, she will lay eggs even without being with a male, much like chickens do. If thats the case and she hasn't been getting proper calcium and UVB and does not have a lay bin she very well could be egg bound, which is fatal.
Temps & Humidity - chameleons need specific temperatures and humidity levels in order to thrive in captivity, we will need to look into what your girls requirements are but this is really important as well. I would recommend moving her away from the window, the heat from the sun coming into the window could be blasting her during parts of the day. It could also cause unnecessary stress by seeing birds and other potential predators. Glass also blocks UVB so she is not getting anything she needs from the sun through the windows in your house.
@Beman @MissSkittles - do either of you know about the husbandry care for this little girl?