rubyrue, I'm so sorry you and Ruby are going through this
But don't feel guilty...even with a quick diagnosis and early treatment this one seems hard to beat. You've given Ruby a wonderful life and when it's time, you'll ease her passing. She asks for no more--and you can give her no better gift.
So try to focus on your girl's needs and enjoy every minute you have with her. Ruby is a very lucky girl to have you