Yes, it might...in the short run. But, in the long run and with her kept on the heating pad for several days it just may throw her into a broody state, who knows?
Here's a thought....keep her confined to a cat carrier with a heating pad under her. May just stimulate her hormones into a "broody" state. Hormones is the reason they lay and the ebb and flow of the proper hormones for ovulation is why egg laying is increased or decreased throughout the year.