Bru can't play Frisbee anymore without surgery

Bru is my life.  I don't have children, so she is the closest to a child I will ever have.  
Bru made me a failed foster.  I had been volunteering as a foster for my local shelter and then she came into my life.  She was instantly the perfect dog for me.  Every trick she could pick up on within minutes.  It only took a day to train her to be an incredible Frisbee dog, and she truly lives for it.  Playing Frisbee is everything for her. 
Unfortunately now she has a rear leg injury.  A tore CCL. She can't put any weight on that leg now.  She is effectively a three legged dog.  After a month of rest and anti-inflammatories the vet thought she "might" get better,  but unfortunately that's not the case for her.   She is only 5 yrs old.