Man that really sucks.
The car I had before my r33 was written off too by a P plater. Cops also charged him with neg driving.
To answer a few questions, because your car is listed as "market value" on your policy, it is up to your insurance company (not hers, even though it was her fault) to assess how much your car is worth. (my car was also listed as "market value"...never again will I have a car insured as "market value").
This is done by seeing how much can be salvaged, and the return that they may get on the parts, and redbook value.
I suggest removing as many of the parts that you can and putting the original stuff back on, as they will quote something ridiculous like $500 for a $2000 stereo system.
One thing you can do is you can get the payout and buy back the wreck. If the wreck is only a wreck because it would cost too much for the insurance company to fix the panels - then you might consider doing this, but if your chasis is all twisted leave it be. This option was given to me with my car as the payout was absolute bulls#!t. I could've sold the car second hand for $5000+ more than what I ended up getting.
If I bought back the wreck I could've had it fixed. But the time it would've taken wasn't worth it. Plus I didn't want the car back really. Not after what it had been through.
That really sucks man. You're driving along one day and everything's good. Then boom, out of nowhere.
One thing that I learnt is to always have cars insured as Agreed Value.
Hope it all works out for you.
wil..