Her belly may have been pink a day or two ago and she is beyond that "phase" of the shedding process. If her eyes are looking cloudy and skin a bit dull a shed is coming...

As for making your adjustments, may I suggest adding cardboard to the foil and lid?
What I do is cut the cardboard to fit leaving room for the lamp. Than I wrap it entirely, top and bottom, in aluminum foil and tape it in place nice and tight. Then it just sits on top of the screen lid. This added layer of cardboard will help with temp and humidity control. The foil will keep everything in and prevent the humidity from being absorbed into the cardboard. It will also be much more sturdy this way and last a long time.