Does somebody knows if there is a way to increase Aerie's intelligence? I have wronged to make her study all the spells I have found at the beginning (very useful and strong, like "evil ice-cream", for example), and now she is not able to study almost any serious spell more!
Thanks!

Drink either a Potion of Genius or a Potion of Mind Focusing to boost her INT. This will enable her to scribe more spells which will remain scribed even after the potion effects wear off.

You could drink a potion of genius or mind focusing for a temporary boost to intelligence, allowing Aerie to write more spells. There is no permanent solution, unless you're willing to cheat and CLUA an intelligence tome into the game.

Thanks for help. But are there tomes of intelligence in BG2? Uh, I thought there are not in this game, only in BG1....

The BG2 game uses the same engine as the BG1 game, only enhanced. So you can only cheat them in.

Can't you just make her forget the spells? I think if you just right click on the spell you don't want you can make her forget them. The you'd have more room for better spells.

That is a ToB feature, but why destroy when you can have them all? ;)