Request #55

Looking for a teen reader book from 70’s
The girl was coming of age, “Freddie” for short for Fredericka. Went on vacation for the Summer to the beach, Mother paints. A SECOND reader is looking for this book as well and has provided these additional details: 

I’m also looking for #55! Freddie Brewer & family drive to Long Island to their summer house on the beach. Grandmother brings along a potted chicken. They are joined by Freddie’s aunt and an uncle; the aunt kisses Freddie’s dad while she watches them, hiding behind a freshly-watered bush, ruining the hem of her tangerine dress. Freddie has just returned from her date, where guy put his hand on her breast while kissing her — very racy reading for a 12-year-old in 1971-72! A few other details might jog someone’s memory: Freddie writes poetry with a special pen. She buys a one-piece swimsuit (wisp of fabric) that stretches to fit her developing figure. She can remember herself as a toddler, with her mother as she paints on the dunes, trying to pick out the dark purple center of a Queen Anne’s lace blossom. I believe the word “Seventeen” might be the title, or part of the title, but all of my searching turns up the WRONG books — not Maureen Daly, Booth Tarkington, etc. What I especially remember is the cover illustration (art, not photo) of paperback (probably Scholastic): closeup of girl with long, straight, possibly sun-bleached hair, windblown, eyes downcast so we see her upper lashes (not her eyes) as she faces the reader, with beach/ocean in background. [I have to wonder if this book might have been banned due to that racy scene? Every other book I ever bought from Scholastic is out there in cyberspace, but NOT the one with Freddie Brewer!] I’ve searched titles, topics, genres, location, and Freddie as a character to no avail. Even extended perusals of cover images on Google, Etsy, ebay, etc. came up blank. I KNOW this book is real, and #55 query proves it!!! I read it school year 71-72, but it could date from 60s; that racy scene appears too contemporary for 50s. Anyone???

A THIRD reader remembers this one too, and adds: 
 I remember that they went to Moriches on Long Island and they made a joke about the mosquito bites and “more itches”