Abby's Un-Valentine (The Baby-Sitters Club #127) (Baby-sitters Club (1986-1999))

Valentine's Day is Abby's least favorite holiday. Mushy stuff like valentines, red hearts, and a school dance turn her into a Valentine's Scrooge. When Ross Brown, a perfectly nice guy in Abby's English class, invites her to the dance, Abby tries to set him up with her twin sister, Anna. Abby only likes Valentine's Day for the chocolate and not the "mushy stuff", but someone isn't getting the message.