It’s set in older times, maybe the 17-19th century.
The protagonist is a young, tomboyish woman with blond hair.
She gets pregnant from a (wealthy) man she loves.
Her mother and sister don’t like the protagonist for some reason and they plot to get the rich man to marry the sister instead of her.
Their plan is to make the guy think that he got the sister pregnant so he has to marry her as per the customs of their time.
He gets drunk one day and the mother and sister somehow make him think that he got the sister pregnant.
The father knows everything that’s going on and he’s on the side of the protagonist but he’s helpless.
Some time later the guy has to go to war and he falls in battle.
The protagonist gives birth to a baby which the mother and sister take from her and claim that it’s the sister’s child and they try to claim the fallen guy’s heritage.
The protagonist might have been called Jane or something starting with “J”.
A character in the movie gets kicked in the head by a horse and becomes crippled.