I just entered Labyrinthian and for some reason my follower, Lydia, won't attack. She still makes the same comments and taunts but doesn't draw her weapon/shield. If I sheath my weapon and draw it back out she doesn't follow suit. Normally I wouldn't mind but I've sunk a lot of armor/weapons into her and she uses an enchanted soul trap sword to fill my gems so I really need her to start fighting again.

Anyone else have this problem or know how to fix it?