Supergirl?
If the rumours are true and Warner Brothers are developing a Supergirl tv show, I reckon Ashley would be a good choice. She's a good actress, and she's a close resemblance to the New 52 version of the character.
shareStephen Brien,
Sorry buddy CBS found an actress to play Supergirl /Kara Zorel / Linda L. Danvers in the Supergirl tv series. Ashley Johnson if Warner Brothers likes her role in other films she's starred in, could cast her in Man Of Steel 2 with Henry Cavill as her cousin Superman / Kalel/ Jorel / Clark J. Kent. She will appear in her own film and possibly, Batman v Superman:Dawn Of Justice, and the Justice League Of America films since, she's a member.