Sandy is constantly compared to her grandmother, Mildred.
She has entirely different Ice related powers, gained her archery skills through obsessive training, but that doesn't seem to matter to anyone older than her.
All anyone sees is Mildred. And it's holding her back

(something I did last night that I didn't expect to go this far)

( check out Sandy in context here, even if she hasn't revealed her heritage to Stewie in canon yet, give it another chapter or so http://mannykat8xwebcomics.dreamhosters.com/ )