Brake Recall and Possible Total Loss Accident

I was just in an accident last night in my 08 Nissan Sentra. 2 weeks ago my car had a brake recall done for a faulty master cylinder. Traffic stopped abruptly in front of me, I slammed on my brakes (the first time doing so since the repair), and the brakes did not respond as they should have, and I plowed into the back of a Ford Excursion. As of right now, the body shop is estimating $10,600 in repairs or 68% of the value of my car. they said the insurance generally will total the vehicle at 70%. They are unable to check the status of my brake system until the car has multiple repairs made. What can I do to help this process along to get the vehicle totaled? With the brakes failing and such extensive front end damage, I do NOT want this vehicle back, as I have a 10 month old daughter, and need a safe car. Any input would be much appreciated, thank you.