Supergirl is a legacy name used by female super-heroes involved with Superman and the Superman Family. The primary version is Kara Zor-El, Superman's cousin from the planet Krypton. She has been a member of the Justice League and the Legion of Super-Heroes. The name has also been used by Matrix, a shape-shifting creature from a Pocket Universe who would later fuse with a woman named Linda Danvers developing angelic powers. Power Girl is the Earth-Two version. Super-Girl first appeared as a one-time fictional character in Superman #123 by Otto Binder and Dick Sprang. Supergirl (Kara Zor-El) was recreated by Otto Binder and Al Plastino, first appearing in Action Comics #252. (1959)
Legends of the Multi-Universe (Menslady's story)
Supergirl is married to MagnaAngemon and is Angewomon's mother. She loves both her husband and her daughter very much, and if Angewomon is endangered by an enemy, Supergirl is not pleased with that enemy one bit!