Yes, the dimpling would be from low humidity, so what you need to do is to bump up the humidity and the dimple should be gone in her next shed.
Also, on the analog versus digital situation, do you have a digital thermometer atleast? Here is a pic from a set-up that a friend of mine had set-up with analogs and was experiencing problems with his bp that later had to be put down. When I brought a digital to double check the temps, this is what it showed... (the black stick-on thermometer showed 88 warmside temps, while digital max'd out at 120)
http://www.ball-pythons.net/forums/s...ad.php?t=46472