I don't really know but I would guess they would use a nest box. You don't state which Calotes she is so here's what I could find:
Calotes calotes - 6-12 eggs that hatch after 79-84 days at 20-26°C(68-79°F)
emma emma Gray - 4-6 eggs that hatch after 62-74 days at 25-28°C(77-82°F) or 100 days at 19-22°C(66-72°F)
mystaceus Dumeril & Bibron - 7-11 eggs that hatch after 60-70 days at 24-26°C(75-79°F)
versicolor - 1-25 eggs that hatch after 37-79 days at 22-23°C(72-73°F)
If you can't post a photo for ID-ing her I would recommend you find a copy of Agamid Lizards by Manthey & Schuster and look through it.
Good luck!
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Marcia - FroggieB Dragons
www.froggieb.com/MHDHome.html
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Signature file edited. [phw 9/13/04]