The girl in yellow

Photo by Paul McCartney 

 I recently listened to an interview with Paul when he was talking about this photograph of George that he took.  He says something along the line about how we'll never know who the girl in the yellow is.  Well -- I remembered that I had the top photo and there she is!   I still don't know who she is, but at least she has a head in the photograph.   It looks like she handed George a drink and had one for herself.  Anyone have any idea who she might be?