Board Thread:The Flash discussions/@comment-9346948-20180523070317/@comment-3221148-20180527095435

Stryzzar wrote: Congrats, we all guessed Mystery Girl correctly Actually, no. We all guessed she'd be Dawn Allen, but she's named "Nora", who is, in the comics, a different daughter of Barry (not from Iris).

http://dc.wikia.com/wiki/Nora_Allen_(Justice_League:_Legacy)