Are you measuring belly temps or ambient? I know that mine is in a tub and has belly temps of 90-94 on the hot side and 80-85 on the cool side, but the ambient temp right now (winter) is around 75 consistently. If you're measuring ambient (air) temp and reading 80, the belly temp on the warm side may be too hot for her... Try placing the temp probe directly on the surface to see what the surface (belly) temp is...