Cooling your female while she's gravid could cause a bunch of problems. Usually, gravid females eek out warmer temps and remain there.
Yes, before you cool, you should be certain whether your female is gravid or not.
While I cool my animals and believe it is the most productive strategy, I have seen animals produce babies without being cooled.
It sounds like tor pair is a little out of sinc with each other. Did you introduce them already without cooling? Why do you suspect she's gravid? What signs/symptoms are you observing.
Of course, you can go back to Dave's "Breeding 101" for a refresher. i also had an article published recently in the 2009 issue of "Reptiles USA". in it, I walk through the breeding startegy I use step by step.
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Mike Lockwood
www.tooscaley.com