First off, welcome to the forum and back to the hobby.
If she's that old and large a mouse is definitely not enough food. She should be eating small or medium rats.
If she's acting a bit nervous, it could be because her enclosure is pretty wide open. I would cover the sides as well as the back to improve her sense of security.
I'd also add some clutter to the enclosure, using fake plants, tree branches, rocks, etc...
It's also recommended to have 2 identical hides. With different hides the snake may choose one over the other for security and will sacrifice thermoregulation in favor of security.
Also, I only see 1 wire in the pics...are your heat sources regulated by a thermostat?
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