From what I gather, the original ad has gone missing. The people that have the horse now were trying to give it away. They have had it a couple weeks, and got it from someone who lied to them and told them the horse was safe and rideable, just to get rid of it. The people who lied and conned the sellers into the horse were the people that the hateful woman had given the horse to, and she's pissed because she thought it was the same guy SHE gave her horse (who she no longer wanted to deal with) to for a supposed "forever home" as a pasture pet and SHE was also lied to by the same person that gave the new owner the horse. The whole lot of them sound nuts though.
"Keep a leg on each side and your mind in the middle"