I wish I could explain that one myself. I have social anxiety and I tend to open up more this way than I do in person, but I wouldn't be doing what she did. I would say just shrug it off and chaulk it up as just a strange woman and continue one with life. There are many kinds of people out in the world and we don't always understand everybody we encounter. Perhaps she was interested in you but has social phobia and would begin to feel panicky once she saw you and was embarrassed to be seen in a panic attack. Who knows?