Aye, once again, sorry for laughing and stuff, I can imagine your disapointment when you got it in the post, so I do feel bad for you, it is crap. If I could knit a frickin cardigan I'd knit you one for free.
You need to complain to her about it man, she might be some nice but dim eccentric knitter person, but she needs to know to take care in the future with the commisions, she should make you another frickin cardigan, that's what she should do.
I dunno, maybe she will, send her an e-mail and tell her she messed it up.
I dunno how much wool costs, but I imagine nowhere as much as 200bucks for that cardigan, she could maybe do you another one and still have a profit, so even if she is a bit stingy about the money, she might make you another.
But you definitely need to complain about it and try to get another one made.
i need to go to bed, but try and sort this out.