I just did a front leg amp on my 9.5 yr old. Look at "Tanzi loses a leg tomorrow" topic. She can't be stopped. She pushes me out of the way telling me in no uncertain terms that she's got a lot of life left to live.
I also went the amp route to my 12 yr old back in 2010. She had a great 6 months. She still chased deer, scaring the crap out of me.
Most people who went the amp route questioned themselves if they did the right thing for 2 weeks after the surgery. But I can't remember anyone say they regretted it after that 2 weeks were up.
Take a look at the thread titled "My boy Taylor". He's a front leg amp.
9 is actually a good prognosis age. Usually younger or older dogs have a worse prognosis.
The reason I went the amp route is that I work full time and I feared coming home to a dog with a broken leg.
But, please remember, whatever decision you make, it's out of love for your girl. No decision based on that is wrong.
I wish you were closer to NJ so that you could meet Tanzi.