S. Triangulosa Death?

[goaethic]

One of my S. Triangulosa, the younger of the two, has died, sort of? I found her at the bottom of her enclosure, only part way curled and unresponsive. Later, she was fully curled, but the next morning she had moved and was upright, but unresponsive and partially uncurled. For the last 2 days or so shes been on her side, legs out, and unresponsive.

I dont know what this means.

There is no way she could've been poisoned, my other girls are okay and still going, even my eldest which hasn't eaten in over a month because there's no webbing for prey to be caught.

Does anyone have any ideas of what this means?

I tried leaving a droplet of sugar water near her mouthparts at the suggestion of others, but I've had no luck.

 

[The Snark]

If in fact deceased, here's your explanation: https://www.ncbi.nlm.nih.gov/books/NBK539741/
Pertains to human physiology but gives some idea of what goes on post biological death in all animals with sensory and nervous systems.