So I e-mailed the lady again with a few questions. My friend has not heard back from the horse rescue, but hopefully she will soon. I might just take this mare and put her down if nothing else, but I am not going to pay $500 for her. I just think thats crazy. This might be biting off more than I can chew, but I am still going to try and help this mare somehow.
Thanks for your very sound advice M2P! I asked what kind of vet care this mare has received for her injury so we will see what she says. Right now I am off to bed....if I can sleep :/