In the original Monsters of Faerun book, the hairy spider was just a relatively big spider. Then came the web enhancement
here which gives it an LA +0.
The question becomes, is this intentional? On the first page of this enhancement, it says
As in the revised Monster Manual, level adjustments are not included for monsters whose level adjustments would make them epic-level characters, or for creatures with Intelligence scores of 2 or below...
Whoops. They definitely gave LA to a couple things without any Int scores, and the regular Hairy Spider is among them.
Would you allow such a character? How would you play it if you did?