Hello and welcome! I'm sorry your cham isn't doing well. I'm going to ask a few questions.
Could you post some pictures of your enclosure from top to bottom including the lights you use?
How long have you had her? Has she laid any eggs?
What supplements are you using?
Where did you get her from?
I'm no expert on veiled chameleons, nor have I owned a female,
@Beman @MissSkittles might have some advice for you