So this may not be D3 overdose.... The big box petstores do not use the right supplements... But they also do not use the right UVB lighting.
This may very well be linked to incorrect UVB lighting. Which it looks like needs to be adjusted on your set up as well. The coil bulbs will not provide what they need. We recommend a T5HO fixture that runs the width of the enclosure with a 5.0 or 6% bulb strength. This website will walk you through complete current husbandry recommendations for chams and it talks about the uvb.
https://chameleonacademy.com/chameleon-husbandry-program-getting-started-with-chameleons/
Per the supplements your going to want to use calcium without D3 at all feedings because this balances the phosphorus to calcium levels of the insects we offer. Then only two times a month say the 1st and the 15th you want a multivitamin that has vitamin A and D3 in it. Repashy calcium plus LoD version is a good one for this.
Typically D3 issues can take longer than just a month to show extreme issues. But it may be contributing to the chams issues. Which if that is the case it would take a good 6-8 weeks for these levels to reduce. D3 is fat soluble so it stores in the tissues. So it is not a fast thing to detox them off of. But commonly with D3 issues we will see signs of Edema which I do not see on yours.
And I have to agree from all the pics you have shown this looks more like a female. If you have some pics of the tail base we can confirm if you did get a male.