Tanith's going to leave the manor and find an abandoned village with three or four villagers left. I'm thinking of making something to do with wrangling up the horses from the surrounding estates that have escaped their pens after their owners died. I want to incorporate more with the horse skills but I don't want to make it a Hidalgo thing... the horses have to be more of a force, like the weather, except they can be harnessed.
This screenplay is going to have to skirt some lines, because the horses have to be a big presence but not in a PETA/Black Stallion way, and Tanith has to be a strong female lead but not in a Xena Warrior Princess way.

Tanith is understated, stubborn but in a passive aggressive way because she was raised under the radar, assisting her well-liked, widely-respected father quietly. The horses are familiar but she treats them with a certain superiority, they are still animals.

http://http://www.horse2buy.com/horse-breeds/irish-draft.html

The horses will be Irish Hunters, not that it will be clear, but it helps me.