I agree with everyone else. When I take Keegan to the park that doesn't allow dogs offleash, I only let her offleash inside the totally enclosed baseball diamond. Park officials have seen me and noone has said anything.
I also think that maybe the reason the dog and lady freaked is b/c you "ran to them screaming my head off". I would freak out to if someone did that.
When Keegan and I were going into the dog park awhile ago, a couple were coming out with 3 dogs. She asked me if I would take Keegan about 50-60 feet away b/c she has 2 dog aggressive dogs and didn't want Keegan to get hurt. She was very nice, smiled and said "THANK YOU VERY MUCH ENJOY YOUR WONDERFUL DAY"
Bottom line is you illegally had your dog off leash and the other lady was following the rules.
Oh by the way, why is it you are so speedy condemn this lady and her dog. It sounds like you would have her tarred and feathered. You say it is abused etc, if it was so abused she wouldn't have had it at the park. Yet you also quickly judged Ashley and Chewy, without reading the whole thread either. And Chewy WAS dog/people aggressive.
Point to ponder.