Eek; you're 5 feet tall and they sold you a 48? I gotta say that that seems a little big to me, too. That's the size Jamis I own (in an Aurora), and I'm 5'4.
And her inseam is only 26". This does seem to be a sale that should never have been made. I am an inch shorter and a Jamis dealer said maybe, just maybe a 44cm will fit me but it might be too big.
Queen, good to hear that Jamis is willing to sell you just the frame.