I read a collection of short stories in the late 80’s (maybe very early 90’s.)  The stories from the collection that impacted me involved teenage girls coming of age.  One story involved two teenage girls shoplifting at a Woolworth’s (this helps date the collection maybe.)  There was a story of a teenager babysitting some little girls whose mother was in the hospital after a terrible car accident.  The mother passes away during the time the young woman was babysitting.  She must act as an adult to break the news (or not) to the girls.  This story had mermaids within the title.  Another story involved a young woman at a wedding in a faux chalet-like event space.  She goes off by herself (in a bridesmaid dress?) to have a moment alone reflecting on her new near-adulthood when some creep exposes himself to her.  I’m unsure if the collection was classified as YA, but the stories definitely resonated with me as teenager at the time.