Lolth is the kind of supervillain who has a whole web (heh) of Deadman switch plans to wreck absolute and utter chaos across the Multiverse out of spite upon her death.

She would happily break Drow and Elven society utterly just because she can be extremely spiteful and brilliant.

It would not be pretty. In a way, that's probably how she managed to stay alive so long while having antagonize every other gods of the Elven, Orcish, Dwarven, Human and Abyssal pantheon. They know it'll be too much problem after they kill her.