Unfortunately, most of the people selling chams at those reptile expos in SA are snake experts, and don't know much about chameleons. They sell their chams too young, and the so-called 'starter kits' they sell are really inadequate for chameleons.
Anyway, all is not lost. There is a lot you can do to remedy the setup.
First off, those red heat lights are not correct for chameleons. Chameleons respond to visible light as a source of heat. Instead of the red light, you should be using a regular spot light globe as a heat light (they sell them in either 60W or 100W in any supermarket).
The key thing with heat bulbs is that you need to get the basking temperature set up properly. For your cham's age, that should be about 29-32 degrees C. You should have an accurate digital thermometer (preferably with an external probe) to test that the temps are correct. Don't set the bulb too close to the cage to avoid burning your cham (and melting the cage if it's a Flexarium). A 60W bulb from about 10-15cm above the cage should be adequate.
As for the UV light, make sure it's a 5.0, and not the 2.0 bulb (I heard a few people recommending 2.0's for chams - not a good idea). And remember you have to change those bulbs every 6-12 months.
Veiled chameleons generally become sexually mature at about 6 months, but they have been known to lay eggs even before that age. So you should be prepared for that possibility in the coming months. The tub of sand should be left in there permanently. She'll let you know when she's ready to lay by starting to dig in the sand. That's when things get a little more complicated.
Read this article to gain some more insight:
Making a nesting site
Also, do a search on these forums for 'nesting' or 'egg laying' - there are many invaluable posts here by experienced keepers.
I think it was Will Hayward or Dave Weldon that posted some great pics of a nesting container made from a large plastic garbage bin.
You should read this article today:
Introduction to chameleon care, and then read everything you can at the rest of the site:
Chameleons! Online E-Zine
The Chameleon's Dish that I referred you to previously is a also a great source of knowledge.