She is, which is why Doc doesn't worry about her (too much, after all she's still a lady but the fact that the tree is frolicking in the river tells him she can hold her own) as he reloads the crossbow another time.

And aims for the driver.

He could aim for the horses, but...then he has an idea, and instead of firing he takes off through the undergrowth to get in a good position for when the cart comes near enough that he can get in front of it.