Perhaps its easier to explain what should happen with a male and femalem reproduction, etc.
When a female veiled is reaching sexual maturity she will develop mustard/yellow splotches...and when she is receptive the bright bluish dots. Non-receptive/gravid coloration includes a dark background....but the female doesn't always display this dark background. She will do it when a male is within her sight and often with the keeper or another veiled female.
When you show a receptive female to a male, she should remain her calm green colors with the dots and splotches. Her body will not be inflated and she should move slowly away from the male.
If he recognizes that she is a receptive female, he should brighten his colors and pursue her but not show his aggressive colors and attitude (gaping, hand held up close to the body, hissing, etc.).
If the female is non-receptive/gravid she will hiss, gape, sway back and forth, darken her background colors and even lunge at the male if he is close enough.
They should not be put together unless they are both receptive to each other. About 30 days after the mating the female should lay eggs....but it depends on where she is in her cycle when they are mated. Sometimes it will be sooner. The should be separated once the female starts to reject the male (dark colors in the background and behavior).
If the female veiled is not mated and does not see a male, then she may lay eggs every 120 days or so...but its also possible that she won't lay any eggs. It depends to some extent on the husbandry. If she is overfed she will produce large clutches and there is IMHO more risk of eggbinding.
You need an opaque container at least 12" deep and 12" long and 8 inches wide in the cage for the chameleon to dig in to show you that she is ready to lay eggs. Some of the chameleons will actually lay the eggs in this container, but some of them do better with a larger container. Having the smaller container in the cage though, will allow her to show you that she is ready to lay.
When she is digging its important not to let her see you watching her or she will abandon the hole thinking that its not a safe place to lay the eggs. If this happens often enough, she can become eggbound and die.
The female may dig several test holes but should finally decide on one and dig it until she is content with it. This can take a few days....but when she is finally happy with the hole, she will turn around bum down and lay the eggs. This often happens in the evening with veileds. She may even stay in the hole overnight.
When she's done laying the eggs she will fill in the hole and pack it down...and return to the branches.
If the female is unable to lay her eggs she will eventually become eggbound...and at this time may keep her mouth open a lot, sit low in the cage, become lethargic, etc.
Much of the time, if the husbandry is right the female should be able to get through all of this process including laying the eggs with no problems...unless there is a physical reason for her not to be able to lay them (reproductive system issues/deformities, deformed or fused eggs, eggs that are too large to lay, etc.)
I hope this will help you figure out what's going on with your chameleon.
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