Hi! If she gains weight, becomes restless and starts to go to the bottom of her house then it's likely that she's gravid.
A few days before laying she may stop wanting to eat and become quite grumpy.
She will need a container at least 12 inches deep and wide filled with moist play sand, soil, eco earth, something that can be dug into a big long tunnel.
If you see her start to dig then you should leave her alone and cover her enclosure over. If she is disturbed during laying she may abandon her hole and become egg bound, then you have a problem and need to see a vet!
A female veiled or panther will reach sexual maturity between 5-6 months of age, and can start producing infertile eggs at this time.
You will typically see a change in coloration, where the females get dark (panthers will get dark gray with orange and veileds will get a dark almost black background with blue and yellow spots) especially when upset.
You will also notice that she will look fuller around the middle, especially towards the back of her body, closest to her back legs. You may even be able to feel eggs if you gently feel around her abdomen.
If you set up a laying bin in her cage and ever notice her digging around in it, it is vital that you leave her alone! At that point we recommend putting up a sheet or something over the cage so she can't see you and she feels like she's getting privacy. It can take females 1-3 days to go through the entire egg-laying process, so don't get too nervous when she starts. When she emerges you should notice her dramatically thinner, at which point she will need water and food. If she's not much thinner she may not have finished. If she takes too many more days then you might want to consult a vet.