Didnt she offer to buy the horse back? If she did, then take her up on her offer. You would no longer have to worry about it, and you could look for a better horse that suits your needs with a little more experience under your belt.
I would LOVE to put him on the next trailer back!...but it seems like she made the offer to save face. She keeps throwing out the excuse of saddle fit...never once blaming the ankle held together on hopes and dreams! I don't think she imagined I'd take her up on the offer.
Daisy - Welcome to the forum and I'm sorry that this happened to you.
However, as sorry as it was for your friend to do this to you, she did. You have to take responsibility for your part. Always always always have a PPE done, or accept what you get - friend or no friend.
If she will buy the horse back, who cares if the offer was just to save face? If you now keep the horse instead of sending it back, you've made yet another choice that you have to live with.
If possible, SEND IT BACK. Chalk it up to experience and a lesson learned.