Laurel Kent
From superman.nu: Supermanica
Laurel Kent is a thirtieth century direct descendant of Superman. She trained at the Legion Academy and applied for admitance to the Legion of Super-Heroes, but was turned down. Her only power is invulnerability, which was considered a duplicate of other members' powers. Due to her Kryptonian heritage, she is vulnerable to Kryptonite.
While at the Academy, she was shot at by a marksman using a kryptonite bullet. This was part of a larger scheme to seek revenge on all the descendants of the Justice League of America, of which Superman is a founding member.
(First Appearance: SB No.217, June 1976 "Future Shock for Superboy")
