Understand why you did it, don't agree with how, to be honest, but it's your decision. The pound would probably have been a better option although to be honest, unless it's a no-kill shelter then chances are she would have been put down anyway, so I guess in a way it was better for her to go with her master than in the hands of strangers.
I was brought up around two collies and a German Shepherd, and there were a couple of times that I did stupid things...like grab a handful of fur. What my mother did was put a child gate in the doorway between the kitchen and the living room, so the dogs stayed in the kitchen and I stayed in the living room, but obviously your situation will vary.
It would probably be best to hold off getting another dog until your son is older, it eliminates the chance of kid/dog misinteraction completely. Rescue cases are always a toughie because you don't know what the dog had been through beforehand and with her getting old and her senses dulling, old instincts come to the fore. Like I said, it probably would have been better to go to a shelter, some of them in the states are quite good with problem animals but alas they are rather few and far between and looking at it realistically, your local shelter probably wouldn't be one of them, and thus she would have spent the rest of her (probably short) life in a pound full of constantly barking dogs, confused and scared, and being even more aggressive because of it and ultimately being destroyed because she was unrehomable.
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