Why is Kaine glowing with a green aura?

While hunting for Wolf Pelts in the Desert, I noticed at some point Kainé had started glowing with a green aura. Nothing else about her seemed different aside from the green glow, and the aura went away after I exited the area.

Why was Kainé glowing with a green aura?

Kaine glowing green


Solution 1:

She's been poisoned.

Most likely caused by one of the scorpions hiding underground.