Temps are dangerously cold. You don't want your cool side to be lower than 75 but 78-80 is ideal. Your hot spot should be around 89-92 (just make sure hottest surface she can touch isnt higher than 92). Remember to take floor temps below the substrate at the surface of your tank where your heat pad is.
Honestly sounds like she's trying to warm up in her pool/water dish since its over the heatpad.
Bring those temps up and still keep an eye out for mites just to be safe.