Hi, I believe she is getting ready to lay eggs. @MissSkittles has a great blog on laying bins and chameleons egg laying habits I’ll attach the link.
https://www.chameleonforums.com/blogs/veiled-chameleon-laying-101.2488/
Fogging would be the best way to get nighttime humidity up. But if you fog make sure your nighttime temps are below 68 Fahrenheit. I’m not sure about daytime humidity but I’m sure someone else will pop in and help you with it.