Car insurance and accident investigations?

My Gf was driving on the freeway going home from school. While driving about 10 car lengths ahead she saw that car were swerving out of the way. There was a stalled car in the number 2 lane. She had enough time to slow down and change to the number 1 lane without any incident when she was suddenly rear ended on her back right bumper. That force sent her into the ceneter median aand hit her front driver side hard enough that it spun her around and faced the opposite direction (facing traffic). Long story short she has severe front and back end damage on a Brand New 2008 Civic that she is leasing. After speaking with the appraiser of the he mentioned that it is likely a totaled loss. Ahe has full coverage insurance with AAA but don't think that she has GAp insurance. How is this going to affect her lease that she just entered a month ago. She was not at fault and the accident report hasn't been finalized. Will this affcet her in getting a new car and insurance?