Sorry for the delayed reply - been a long day at work.
This is what she does *every* evening - she's doing it right now, actually. If we walk past her enclosure, her head raises but she doesn't move.

We got her last month at Repticon. Not sure her exact age, but I know she was born 2023. Unfortunately, I don't know her weight and not really keen to stick my hand in to pick her up right now. We feed her F/T rats - pups (?) 19.1-29 grams (was the 3rd size up). We were told she was eating 1 per week; we fed her twice before she shed over a 3 week period - she didn't want to eat right away after we brought her home. She had a good shed, only took about 2 days. After she shed, she ate next day then she started doing the wait-and-ambush thing. We fed her again 3 days later on this past Sunday, and has been like this all week. She hasn't been handled much over the last week because we were leaving her alone to digest.

Now I am at a loss. Do we need to get bigger rats? Are we doing something wrong? Should we get more plants in her enclosure? The space in front of her hide is free of plants so we can do the zombie-rat-walk thing when feeding.