I'm just going by what Star Boy said when Jessica introduces herself. "Everyone Know Limelight"
Implication at some point in the future, she may go by Limelight.
She is still however from this JL's time.
Yeh also going buy the interview vid (first page) creators wanted to inject some new characters into the mix, and explore new personalities.
Hence instead of J'onnz, GL(John) and Flash, they are exploring Terrific, Ms. Martian & Jessica.
And yes Terrific's line implies the others are unavailable.
If this is
officially even in in JLAU continuity, I don't think has been stated.