Amy Green is Rachel's older sister. Amy comes to Rachel twice, both times because of boyfriend problems. She repeatedly wrongly calls Emma, Rachel and Ross's daughter, Ella. The first time she sees the baby, she declares "You know what would be great? If you guys died!", thinking she would inherit the baby and her trials and tribulations would be made into a movie (similar to Baby Boom with Diane Keaton). She is, however, greatly offended when she learns that actually Chandler and Monica will get the baby instead.
Having later become engaged to the wealthy father of an old boyfriend, she is convinced by Rachel to leave Myron - her fiance - and try to make a new life on her own, only for this attempt to fall apart when she has Emma's ears pierced while babysitting her. Rachel and Ross flip out and Rachel forces Amy to move out, Amy claiming that she has decided to become a "baby stylist", giving fashion advice for infants. Before Amy leaves, Rachel and Amy make up by gossiping about their sister Jill, who has gotten fat.
During her appearances Amy displayed a great lack of tact and a poor memory, initially failing to recognize Ross and Monica and subsequently insulting them while describing them.