Who is the woman in the picture who's sitting on the ground, in front of Robert, Kellan and Peter, looking up?

I just can't decide it! I'm guessing she's Elizabeth, because she's the only who's missing (there's Robert, Kellan, Peter, Nikki, Kristen, Ashley, Jackson, Cam, Eddie, Taylor and Rachelle) but she doesn't look like Elizabeth. oder is it just me?