Rivalinnen der Liebe (1999)

The spoiled Leonora swears eternal revenge on her classmate Cassie out of jealousy and ensures that the orphan girl flies from boarding school. Years later, Cassie marries the stud owner Tyrone, the ex-lover of Leonora's mother. Leonora has an intrigue that nearly ruins Tyrone and puts a strain on his marriage. Cassie is miscarrying. After the accidental death of Tyrone she challenges her rival to an all-important horse race.

Unfortunately the movie Rivalinnen der Liebe is not yet available on HBO Max.