I really do not think she is talking to Will because when Peter comes down I think she is off the phone, and then when Peter tells her "I love you" she has not phone in he hand, which means that she calls somebody on her way up. I mean she could have called Will back but I do not think the conversation when she is getting the cab is the same as when she on the phone running with Peter upstairs!
Its Monday!! ONE MORE DAY !!
