If you have the CHE and the UTH, you will be just fine.

Once you get the thermostat you won't need the repti carpet. Just a thin layer of aspen.

Why do you have an inch of glass on your tank? Most tanks use 1/8" glass.

This is exactly where you should be taking your temps so that is good. She might not be trying to burrow now, she may not ever try and burrow. Many snakes will inadvertently move the substrate while getting into a coil or while just moving around.