The Native Americans didn’t have horses. The only horses were those that came from Europe. The Native Americans in the Southwest might’ve gotten some from the Spanish, but there weren’t any already in New England.
Given how cruel she is, why did he stop for her? Next, he’d have fewer issues if she didn’t cover his eyes. Finally, doesn’t she love hurting snakes? Why is she trying make him avoid the snake?
The spider also eliminates insects (read mosquitos) that might bite Spook.