Elizabeth Levy published 22 Gymnasts books, between 1988 and 1992.
I don’t recall ever seeing one.
Trouble in the Gym (The Gymnasts #5) on Amazon
via Just like fine wine…Adult Gymnastics Group
Elizabeth Levy – Gymnasts books
Published by
tumbling, tramp, diving, acrobatics, circus, cheer, dance, martial arts, X sports … and more
Gymnastics Coaching.com 
I bought a whole set, second hand, on eBay around 2005, passed them onto a gymnast friend. My girls loved them, a fun chapter book series.
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