It’s a YA Book. I read it in the 1980’s. It’s about a dad and daughter. The dad is a house flipper (although that concept wasn’t around in the 80’s) – they live in the house while he fixes it up because money is tight. She starts working at a barn and doing chores and falls in love with horses. Other girls there have more money and nicer horses. The “prettiest” girl hurts herself in a competition and then the main character gets to ride her horse
Can you help?
Possibly the Saddle Club series by Bonnie Bryant. Horse Crazy or Horse Shy? The series was reissued several times after its initial 80s release.
Maybe Happily After All by Laura Stevenson?
Summer Pony, by Jean Slaughter Doty (or one of her other books in the same vein?)
The Rain-Cloud Pony