How did William Wallace's wife die in the film Braveheart?

William Wallace (AKA "braveheart") was captured by the English king, known as Edward the Long Shanks , tortured and eventually beheaded. I don't know if this next part is true but i have heard that his body was torn to peices his arms and legs sent to the 4 corners of England and his head set on London bridge as a warning to other "traitors". Though he did not live to see it Scotland did win its freedom...for a while at least.