Thank you for the reassurances! I feel like I've found a newborn baby on my doorstep and have no idea what to do. Despite spending months on the forum!!!
She did find her way up to the top, she's now clinging upside-down and mooching about up there. I've put some small dubia dusted with calcium+ in her feeding dish, in the same place as she used it yesterday, and they are scrabbling about in an attention-grabbing manner, so I'm hoping she'll warm up and feel like nomming a few again soon.
She also left me a present! A nice healthy-looking poo right at the edge of the enclosure where I sit, on a leaf, at eye-level. Urates look small, but white. She likes the mister already, went running over to it this morning and started squidging her eyes at it, licking her lips and shooting at water drops, which I'm hoping is a good sign!
Definitely happy to leave her to it for a while!