URGENT!! NEED HELP SAVING RESCUE HORSE FROM EUTHANASIA!!

My name is Stephanie and I’m starting this fund for a friend in need. She sold one of her rescue horses to a someone who seemed like a good fit, but has now threatened to euthanize the horse because she got way too in over her head. We have reached out and tried to buy the horse back, but the woman refuses our offer, and my friend cannot afford to pay a larger amount. We have asked if she would willingly surrender the horse and have tried to get veterinaries involved but they legally cannot. We need help raising money to get this horse back to its rightful, loving owner before she is wrongfully euthanized.