Which Earth is the JSA going to be on?

[Dataweaver]

But then there's the issue of when she was born to Bruce and Selina if the main Earth 0 versions are not all that much older than Helena is . . .

To clarify, I am not saying that Helena is the daughter of the earth zero Batman and catwoman. I'm saying that she is the daughter of the now destroyed Earth 2 Batman and catwoman; she is a foreigner to Earth zero, the same way Power Girl is.