Wait, there is:wait! Didn't Superman and Batman found Kara in the Superman/Batman comic series?
Kara Zor-El (New Earth)
Kara Zor-El, also known as Supergirl and Linda Lang, is a Kryptonian superhero based in Metropolis. She is the cousin of Superman, Lana Lang's foster niece and has also been member of the Justice League of America and Legion of Super-Heroes. Kara Zor-El is the daughter of Zor-El and his wife...dc.fandom.com
Sooooooo.... there are 2 karas on New Earth, cool
1- A non-Supergirl Kara
2- A non-Kara Supergirl
3- A Supergirl Kara
all three of them, in New Earth?