Hi..I've only had Sassy for about a month now. I got her from a man who never handled her or let her out of her cage and she's 12 years old. She is sweet (sometimes) and loves attention, but she will NOT allow us to touch her! She is very moody too..lol. She loves being out of her cage but is sometimes very difficult to get her back in. We can feed her out of our hand (even my granddaughter can) but that's as close to touching as it gets. I know I've only had her a short time and we have a long way to go, but I am hoping that if she sees us with another bird, she will realize that we are not a threat to her. Also, they can keep each other company while we are not home. All in all, she is very nice considering and we love her dearly!
I am not an expert around here, but I don't think getting a second bird will help you train the first bird, there are jealousy issues, territorial issues, and the new bird can even learn bad habits from the first bird
Some people would say that Amazons are not the most "touchy-feely" kind of birds
(I know a little something about Amazons, we had one in our family for many many years)
My Amazon loved me and my children dearly, he sat on my shoulder for countless hours
(my daughter is holding him in the icon above and you can see a couple of pictures of him below in my signature)
That being said, he could definitely be kind of grumpy, sometimes testing us to see if he could have his way
(be the dominant bird of the house)
For your bird even if she's been cage bound for years, with proper training you should be able to create a good relationship with her
(someone here with a little more experience when it comes to training can point you in the right direction)
Remember, she can live for more than 50 years and is VERY intelligent
(they're about fourth on the list right under Dolphins, chimps, and elephants)
She deserves to have the best life that she can have, and will reward you with many years of love
I can tell you this, training and having a good relationship with
any bird requires a daily routine, you have to work with the bird
every day, you have to be completely consistent with your techniques doing things the exact same way every time so the bird gets used to that
You have come to the right place

Everyone here is very helpful
BTW, I saw the pics of Sassy in your post from 04-30-2014, She is Beautiful!!
What will you do now?
Joe