My brother's got a similar case going on - it's coming up to court stage now apparently. Bloke hit him in the rear three quarter (behind the rear wheel) and wrote his car off, and the insurers are fighting it all the way! Considering most insurers are not looking to do the right thing, and simply minimise their costs while getting a claim sorted, it's crazy. Hope you get it sorted mate - at the end of the day, if she hit you in the rear (and she's not denying it), and there is no proof of any previous damage, she's on thin ice - f**king people!