As far as I know, Batman and Superman won't be a part of the JSA.
So unless the JSA is on a different Earth, why in Zeus' name would you want to retcon Diana into being BOTH a WWII-era AND a "modern day" hero on the same Earth?
And besides, don't forget, Diana wasn't really a fully-active "member" in the early days of the JSA. She was their recording secretary and didn't get her own separate chapter in the stories for quite a while!