Pictures on da interwebz thingy suggest that barrel-racing is done by very physically fit “white” girls (of all ages) riding very physically fit and well-disciplined horses.
You’ll recall that Tonya Harding and her conspirators are all “white”.
I read the individual had access to the barn. I did not see where the individual was a competitor.
Also, dont take my comment as assuming she is not white. She may very well be. Regardless, this is a sick individual. Who else would do something so cruel?