Why did Anna Pavlova only score 7.812 on 17/8/2008 in the Women's Horse Vault Final Ranking?

Her second vault didnt count because she ran while the red light was still on although the judges gave her the nod to go |||because there's a light that the judges use like red is not ready while green is ready and she ran while the light was red meaning her turn didn't count so she got the 0.