Reddit reviews Mermaid Park

Could it be Mermaid Park, by Beth Mayall?

>Sixteen-year-old Amy rush doesn’t expect much from her summer at the Jersey shore, until she stumbles on Mermaid park, an old tourist spot where girls dress in fabulous costumes and put on underwater shows. working at the park changes Amy’s life in more ways than she could have imagined. she finds romance, a newfound self-confidence, and discovers breathtaking revelations about long-buried family secrets.