Totally agree mls... We get dead lame horses, horses cut up walking on three legs, and they all manage a trailer ride just fine.
I don't get her whole thinking, if you sent it on a trial with the provision that they could refuse said horse and send it back, why would you just figure they would take the horse and you were safe from paying anymore board or money if they didn't want the horse.Maybe the OP figured if they took the horse they would not bring it back. A trial is just that, a trial.
I don't do trials anymore and don't expect anyone to do one for me.
In the end she is responsible for the horse, it is hers until the "deal" was final and sounds as if the deal fell through. Her horse her responsibility. Now she needs to do what will be best for the horse, euthanizing, selling at a sale barn, whatever but it is her responsibility and she needs to quit feeling sorry for herself and step up to the plate.