Hi, she looks very healthy in those pics. Cage could use a few more branches and plants, though, especially around the basking area so she feels comfortable up there. She may becoming gravid for the first time, hence the color changes. Or, going through her teenage phase, on her way to be being a lovely grumpy veiled that most people have lol. You have a light that runs constantly? No need for night heat, unless temps dip below 60's F, and then you would want to use a ceramic heat bulb. Light, even the "night" bulbs will upset their sleep, also need to be able to cool down at night is very good for them, it helps them get a good sleep. They will turn dark when basking to help absorb the heat/light. So when you take her away from the light, she will return to normal colours, unless gravid or mad. Have you set up a laying bin for her?
If she is in the window with full sun all the time, your temp readings could be off, as you might not know the temps during the day when you are not around. Windows filter out all the beneficial sun rays, but I have found that it is still physcologically simulating for them. I open up the blinds in my cham's room, and it will shine on half of his cage and he loves sitting in that light.
Eating less - sign of being gravid(or stress from being too warm?)Sleeping more, may be because of the heat. Or even seasonal. I noticed a sleep pattern change in my guys when winter came.
Well there's my two cents, I think I addressed everything you wrote.
