My girl Kleo ate two hoppers last week and one this week (Friday). However I still haven't seen any waste left in the tank, whereas Oliver went twice in that period of time. Should I be worried? Will she just go on her own when it's time?

The ambient temp is around 70 but definitely hotter on the warm side, underneath her log. There it can get up to 90 degrees. I can't do much else about the temp unless I turn her lamp on, but then I have to be careful so that it doesn't get too hot and dry in the tank.