The fact that the agent ran an ad on the horse and is showing it to other folks does not breach the sale contract and does not necessarily show bad faith, poor morals or whatever.
This happens all the time in real estate with back up contracts. They most likely felt the buyer was going to not complete the contract and are looking for back up buyers. This is actually a good thing for his client, the seller.
Obviously, if the agent is selling the same horse to multiple buyers, that is fraud. However, we are only hearing one side of the story here.
The buyer did not have all the cash on hand to purchase the horse. If I were going to purchase a horse without any conditions such as a PPE and intended to negotiate a cash discount, I would bring all cash.
The agreement she signed stated she was going to come pick up the horse and pay the balance due. It says nothing about a PPE or a history on the horse. The next call the agent expected to get was “I have the rest of the cash and plan on picking up the horse on x date, is that convenient?”. Instead she starts calls asking for the horse’ s history, vet records, etc.
There may have also been something said at the time she bought the horse and didn’t have the full purchase price that lead the agent to believe she may not have the balance due. We do not know.
At the conclusion of the phone call when she scheduled the pickup and payment, the buyer could have then added that she was interested in hearing the horse’s history when she picked him up.