It's not like she doesn't know this is dangerous. The Cerise incident proves that. But she can't just give up.
This isn't a long-term solution. It's probably not even a step towards a long-term solution. But it's a perfectly cromulent short-term amelioration tactic.
The brightly-glowing woman reaches--not the bottom of the well, exactly. But the top layer of--detritus. She doesn't untie her rope, but she does tug firmly on the signal-line to let her assistant know to stop lowering her, and starts unfolding her bag.
It's a big bag. She suspects that the "detritus" goes a ways down, and she'd rather not have to do this oftener than she has to.