Sorry for mate,
Three weeks ago I had my Integra Type R hit by a bus from behind so I'm going through the same scenario at the moment.
Car was mint, had spent £2.5k the last 9 months since I got it making it absolutly perfect - new bushes, engine mounts, shocks, etc, it was getting close to perfect:eyebrows:
Anyway, your insurance will not get involved at all unless you claim on it, I just rang mine to let them know and keep everything straight.
The thing to do is claim on her insurance, If the accident is not your fault (which it isn't) you will not have to pay a penny or lose any no claims.
What happens then is that you get an accessor come out and value the damage - i've had two out because I've employed an accident management company for personal injury reasons etc.
The accessors only look at the damage and are not generally interested in whats modified on the car, I had a DC Sports manifold on mine and he didn't even notice. He will then submit his findings to her insurance company and they will then arrange pickup of your car and give you a courtesy car while yours is fixed.