But, Xoman is right. There is another girl there when Adam's mom is crying about possibly losing her son. But it's not a blonde.
The hair color very closely matches Stephanie's, possibly Rachel's depending on the lighting. As far as names go, Rachel and Stephanie both could be Jewish, I don't think the other three have a high likelihood - but that's not definitive.
Definitely not one of the other three as far as the hair goes.
Adam is very tall, and Rachel is tall for a woman. Stephanie is very short. Given the angles here, I'd say it's more likely this shot is Rachel leaning forward.