Hit and run by a women in Costco parking lot

On April 8th 2014 11:30am I was at Costco parking lot in Portland OR airportway, it was Tuesday morning very sunny only a few cars in the parking lot. I was ready to leave, but a woman driving a big truck and hit my car rear bumper, she turned back, looked at me and kept on going, I thought she would stop and she never did. So I quickly found the pen to write down her licence plate number and called the cop. After cop came he can't find her licence plate under the number I wrote down, he said number belong to a nissan car. But I do remember her face and she was the one checked out in front of me at Costco.Then the cop took my Costco receipt back to Costco and found her then called her back. She used the licence plate that didn't belong to her truck. She delay said she never knew she hit my car, I knew she is lying, she was looking at me when she hit me. Of course even little kids know the trick, will say" I didn't do it" or "I don't know what happened".but my insurance company said una