Disappointment of Imoen dual classing to Mage(spoiler)

I wanted to try and keep it cannon by having Imoen dual class to mage at level seven, but I happen to find out that Imoen as a dual thief/mage can't use her bows...which is very odd because she can use a bow in BG2 even though she the same dual class. It upsets me because we all know how she's deadly with a bow and I want her to be the powerful spell caster she is in the later games.