In spring breedings they usually give birth in Aug or even Sept in my experience. My mitchellii breed in late March, early April and give birth in Sept. But from what you describe, It sounds like she will drop soon. Does she have a bsasking spot or do you just keep her whole enclosure that warm? A cool enclosure (70F with a 90-100 basking spot is best. I usually try to provide a ledge type cover so that the female can hide most of her body out of the heat and hang the rear out under the light.