Hi. I find it hard to tell from tummy size or even when there may be visible little lumps. I go by colors and behaviors. She does seem to be getting her big girl colors, so she is probably starting her reproductive cycle and egg production. Each girl has her own unique colors/patterns which as they are gravid (have eggs) darken considerably as they get closer to laying them. Have you seen my blog? https://www.chameleonforums.com/blogs/veiled-chameleon-laying-101.2488/ I have pics of my two girls and each had a different look from the other. One girl just had her dots darken up and it was rather subtle. The other girl had her patterns and dots darken so that they seemed to almost blend together. For behaviors, when receptive, she gets very restless and wanders endlessly looking for a mate. She’ll settle down for some time and act her usual. Then she’ll start getting a bit restless again as she’s looking for a safe place to deposit her precious eggs. As the eggs start taking up space in her belly, her appetite may decrease. One morning you’ll peek in and find she’s in her lay bin, digging away. Don’t let her see anyone. Cover at least the lower half of the enclosure with a light sheet. She won’t care about eating or even drinking much until her job is done. It usually takes a full day or so. She may sleep in her bin, or go to her usual sleep branch. You’ll know she’s done when she’s completely covered up her holes and is back to basking. If you haven’t already made and put in a lay bin for her, now is the time. Play sand (like what is used for kid’s sand boxes) is best. Moisten it until it can hold a tunnel without collapse. More info and details are in my blog.