Exactly, wyoming. Sounds like sour grapes to me. Everything was hunky dory until HER horse got hurt, now this young girl is the devil incarnate.
I'd like to know why an 18 y/o is hanging around with a 14 y/o, anyway. In terms of maturity they should be MILES apart. Plus, there's guilt by association. If the OP thought all of this was fine and dandy before, she's just as guilty as the neglecter/abuser for not reporting her before now.