In the 80s I remember a book and there was a side character refered to as Meridith Meridith. Her bag was monogrammed with two or three Ms. I remember the main character thinking what if that was her middle name too and her name was Meridith Meridith Meridith.
It was probably pre teen and I think there was a dance class or gymnastics class that was a part of the story.
The Sisters Impossible ? Written 1979, "The American Ballet Company has an opening, and Saundra's not sure she's good enough to win it. Worse, she's competing against the supremely nasty Meredith Meredith, who will stop at nothing to get what she wants."
It was probably pre teen and I think there was a dance class or gymnastics class that was a part of the story.