Yes, the tantrum that I was thinking of was when Garion left the citadel.Ditto at you @SeaSwallow, ah yes I remember seeing your earlier recommendation now
Yes she does throw quite a wobbler - Garion escaping the citadel after being crowned was especially energetic! Or when laying into Belgarath following his return to the Vale...
The Malloreon was okay but didn't hold my interest as well as the initial series of books.