Were you keeping the male and female together? If so there may have been some activity that you did not notice which resulted in her becoming gravid. Some lose their appetite when gravid. Has she shed recently? If so, watch for eggs but leave her be, dont feed her. As far as the heat goes, pits tend to get very lethargic when it is too hot, even becoming quite limp when handled. It may be late but it is also breeding time which can make some act funny. Im just throwing out some possibilities here.