Sentence:  Eileen got to dancing , just a little tiny dancing step to a hummed tune that you could hardly notice , and trying to pick up strange men , but each time I was ready to say to hell with it and walk out she 'd pull herself together and talk <WSD>so</WSD> understandingly in that sweet husky voice about the good times and the happiness we 'd had together and there I was back on the hook . 
Meaning of the word marked with <WSD> tags:  to a very great extent or degree