2 Works in Romney Marsh - Monica Edwards
For anyone who's read the pony books by Monica Edwards, this imagines Tamzin Grey and Rissa Birnie from the Romney Marsh series at their high school itself, rather
than having one of the outside adventures the books are about. It's set directly after A Wind is Blowing, the last in the series. Not complete.
This features pony book characters, but it's not horsey and also a bit sad.