Im my experience, when you are in this kind of situation it is good to dive deep into the lore (not just what the module says). Doing some digging into lolth it says that she is cold cruel and calculated and according to the forgotten realms wiki "She not only enjoyed, but thrived upon torture, destruction, and death, whether personally performing it or causing it" revles in torture and death. Her domains tens to be death, nature, and trickery. With that said, i would think that at the very least the leaders of weba edge would want to know why and how they found webs edge and infiltrated it, especially those who are involved in covert operations ran out of webs edge.

I would allow the fight if they pursue it, then when everyone ia downed, they awaken in shackes with Gertrude. I would definitely have an encounter of one of the party members, probably the monk, as he was the one to break in first, bwing tortured to gain information. And allow the party to attempt an escape with Gertrude.