To prevent Yuki my female veiled from having eggs (She's 1 year and roughly 5-6 months old, never had a clutch) I feed her once a week. She'll get a couple of small crickets every other day when Ryuu doesn't eat them, but otherwise she doesn't get much to eat.
I offer her a basking spot ranging from 28°C - 34°C as she should be able to decide how warm she would like to be. So far she has not had any eggs and her most recent vet visit showed she had nothing in her belly, so I am quite content with how she is being kept.
I am a strong believer that it is the amount of food a chameleon gets in captivity that triggers egg growth rather than the backing temperature. If a cham has an abundant amount of food, then of course, it's time for babies! Warmth might be a factor too, but so far she has shown no signs of eggs as she just gets enough food for herself and not enough for developing eggs too.
I hope this does not discourage you from eventually, when you are ready, getting another. You could always try your luck with another female, or go for an easier to maintain male! They also tend to be bigger, which also has a coolness factor of its own!