Mixed race character in a historical

We were bitten by the heterosexual Historical bunny.
So "Yellowstone River Blues" is in the works.

Basically, imagine a middle-aged Erroll Flynn falling for a slightly-less middle-aged Thandie Newton.

The problem is, Paz appeared as profoundly mixed in my head.

Her father is the son of a runaway slave and his Apache wife.
Her mother is the result of a wealthy Texas landholder's liaison with his Mexican cook.
Her parents were burned out and murdered by ranchers/US military who were trying to open the land to white settlers.

Is this too complicated? Is it too Mary-Sue or fanfictiony?


Also, what period appropriate term would she use for her grandfather?
I'm thinking Negro was the polite term in that era.

Would you, as a reader, hurl a book across the room if a sympathetic character referred to her ancestry in such terms?
(unsympathetic characters will have less polite terms)


And if anyone can point me to a website featuring prices in the 1890s, it'd be much appreciated.