Definitely should be in the morning. He needs heat from your UVB light to help digest his food. Feeding him at night right before you turn off your light could cause digestive problems.
https://www.chameleonforums.com/care/healthx/head-neck/
Look at that information. Seems to have multiple health issues. You need to come up with the money for a vet visit, or she might die.
Best of luck.