Hi all, this is my first time posting but I've been lurking since I acquired my (injured at the time) tripod cat in March.  

Background first: My cat, Benedictine Cucumberpatch (BC or Beni for short; she's 1.25 years old as of 6/14/19), was semi-feral and living in the woods behind my house around February of this year.  We trapped her with a cage from our local animal shelter and a whole lot of tuna, and we looked for weeks for an owner before realizing she was probably living on her own. We noticed she sat kind of weird, with one leg stretched out straight, so we took her to the vet expecting hip dysplasia or something similar.  Nope, she had a SUPER broken left femur that healed very, very poorly.  We tried surgery to repair the break, and she was healing really well from that until my giant jerk of a dog knocked her down and completely shattered her healing leg.  Despite several surgical attempts to repair the damage, she ended up with an infection in the bone and we came to the decision to amputate her back left leg up to the hip.

Cut forward a month: Beni had been healing very well from her amputation surgery.  She's been quite mobile and although she's still too scared to leave the garage where we keep the litter and food for our other cats, she's still much more friendly than she was pre-surgery.  However, I was petting her today and noticed she has a shallow gash or raw spot on her non-existent stub.  Looking at the kitty cam we have set up in the garage to keep an eye on her, I just saw she's been grooming/chewing on the site much more frequently.  I'm worried this is somehow connected to her infections during the whole amputation process.  I called my vet to make an appointment, but unfortunately since it's 9pm here I won't be able to schedule an appointment until tomorrow.

My question:  Could this be phantom limb pain?  What can I do to make her more comfortable?  How can I prevent her from making her raw spot worse?  And, unrelated to this but related to tripod cats, has anyone had any success with prosthetics for this kind of amputation?  I worry that the way she moves right now, sort of a hopping thing, is going to be hard on her back and hip.

Thanks for taking the time to read all this, I really appreciate any thoughts!