I’ve found no biographical information as yet on Valerie Beales. Under that name, she has written one pony book, Emma and Freckles. The book has appeared in several American printings. The story appears to be a variation on the theme first used by Josephine Pullein-Thompson in I Had Two Ponies: a pony is sold, and the more or less ungrateful first owner then regrets it and looks for the pony so they can make reparations.
Finding the book
Easy to find in all its printings