User blog comment:Konstant888/The Flash 4x20 "Therefore She Is" - Review/@comment-35478106-20180503071929

I'm still not convinced that this Mystery Girl is Dawn Allen. My theory at the moment is that this woman has come to the past to make sure something does or doesn't happen. And whatever it is, Iris is obviously involved as she didn't want to go anywhere near her. She seemed very distraught before she speed her way out of that final scene.

But the purple and yellow lightning does seem to give it away... But still, I won't be convinced that it's Dawn until the season finale.