At first I could not see any obvious injuries, but as I started to gently extract her from the hole, I saw a substantial amount of hemolymph near the pedicel. (Most of this was absorbed by the paper towel that I set her on.)
Miss Hissypants is suffering from pre-molt syndrome. As I filled her water dish, she unexpectedly lunged toward me and slapped my hand with surprising strength. She then held this threat pose for several minutes.