There are two very important people in a woman's life - at a certain age. When a woman is in an exclusive relationship or marriage, her parents and siblings might not be as close, because there are things she can't share with them, or wouldn't wish they heard.
These two VIPs in her life are of course her man and her bestie. She will introduce the two to each other, and make them free with each other, with or without her presence. Who wouldn't want her two greatest persons to be best of friends?