It's not okay for someone to just "repo" a horse without reason. She got paid, and pictures posted to Facebook are not grounds to "repo" a horse. I believe that, in this instance, it's best to keep with the police and get the horse back. Have the police go out to her house, if at all possible. This is horse theft – we don't just sit around and "try to contact" people!
You must keep us updated on this!
The hills were bathed in moonlight, the shadows not so stark;
Silver light reflected off his brown hide as he held me in the dark
– I love you, Mudpie!