Yea, i figured out as much.By the way i've managed to solve the problem by just reinstalling patch 1.7.This also solves many other bugs, especially in Upper Hadar with Lina's quest and the general area there were some dwarves have the quest icon above their head but doesn't seem to talk to you.Reinstalling 1.7 patch fixed these.
But indeed Mirabella's bonuses and items slots sucks
I'd stick to frog lady
