Thermometers don't control heat sources. ThermoSTATS do. If you do not have a thermostat or dimmer on the heat mat, it can cook your snake. Please look into getting one soon.

What kind of thermometers are you using? This is very important. If you have the probe kind, you are golden. But if you are using the dial gague thermometers, then you are not getting an accurate reading.

Nocturnal means active at night. If the snake is out during the day then that is not normal. Peeking out of the hide is okay.

I would try and get her two identical tight fitting hides. The half logs just don't do it and that is probably why she is laying out so much. You can find opaque plastic bowls at the dollar store and cut a hole in the side and tada! A nice new hide.

She sounds a little on the skinny side. You should probably be feeding her adult mice by now if you aren't already.