Problem is there IS no Kelly blue book or similar reference for "current value" of bikes.
And as far as insurance adjusters go, this is a LITTLE claim, even if it is an expensive bike.
Don't expect them to be nice, but you can expect them to be fair. I suggest finding some eBay completed ads for similar bikes, similar ages, similar components, relatively local and tell the insurance company what YOU think is the current value. They really don't want to spend much time on this so if you write a persuasive letter with some documentation and you don't look like a gold-digger they'll probably go for it.
I hope that the driver was charged with a traffic violation and that her insurance goes up.