I have been keeping veileds for a long time and some of them will lay eggs in a small container. Others need to be moved to a bigger one to get them to lay the eggs. I still leave the small container in the cage though because it gives them a place to start digging...which shows you that they are getting ready to lay eggs.
Will has given you a good description of the type of egglaying set-up to use...and he's right about the vermiculite. I worry about vermiculite causing impaction if the female ingests it.
Letting the chameleon see you when she is digging the hole to lay her eggs causes the female to abandon the hole...if she abandons it often enough, it leads to eggbinding and death. A female may dig more than one hole or dig in the same hole more than once before she lays the eggs (when not being watched) and that is perfectly normal.
A couple of comments about what you said...
You said ..."Plants: No live, fake vines and leaves"...I don't recommend the use of fake plants with veiled chameleons because they are omnivores once they reach about 6 monts of age and I worry about them eating/trying to eat the leaves of fake plants. The plants in a veiled's cage should be non-toxic and well washed (both sides of the leaves). Like Will said, there should be more variety in the chameleon's diet...silkworms, superworms, butter worms, and once in a while, waxworms (they are fatty), etc. and you can give her greens (dandelion greens, kale, collards, endive, ROMAINE lettuce, etc.) and veggies (sweet red peppers, squash, zucchini, sweet potato, shredded carrot, etc.) and fruit (apple, pear, melon, berries, etc.). The insects should be well gut-loaded with an appropriate diet before given to the chameleon.
You said..."Supplements: Repto-Cal in dish"....Do you mean Rep-cal? Does your chameleon eat it out of the dish? You should dust the insects with a calcium powder several times a week. I use a vitamin/mineral powder a couple of times a month too, and because my chameleon gets no direct sun, I use a calcium/D3 powder lightly a couple of times a month.
After a veiled female lays her eggs, I feed and water her well for a couple of days. I then cut her diet back a bit until I know she is producing eggs again. If you feed them too much they produce larger clutches of eggs which IMHO is harder on them and shortens their lives.
Hope all goes well with the egglaying!
