Joanne Hoppe

American author of children's novels. She appears to have written four children's stories, of which one is pony-themed. Although fairly modern (written in the late 1980s) it has a traditional theme.

Horse & Pony Books:

Reprinted in paperback by Troll.
Reprinted a number of times in paperback by Scholastic.
SUMMARY: Spending the summer on a New Hamsphire farm, fifteen-year-old Beth trains a beautiful chestnut horse for a local race and develops a friendship with an unpopular classmate.

Collector's Info:
Easy to find in the USA, especially the paperback edition. Quite a bit harder elsewhere, although can be bought from the USA fairly cheaply.