She's a little over 1200g. The hides could be more snug for her.

Here's what I'm going to do. I'm going to set up the 20L this week to stabilize temps and figure out what I need for heating. I'll make new hides using the current ones as molds using this idea:
DIY hides

Then, if she doesn't eat in the 40 come Friday, she's going to the 20L. If she does eat and I'm satisfied with the 20L, I switch anyways. The 20L is by far so much easier to travel with and maintain temps/humidity.