I was thinking Nu52 Silver Banshee from the Supergirl Comics. But if you haven't read those, that probably wont help. :\

[quote=Wikipedia]In The New 52 (a reboot of the DC Comics universe), Siobhan Smythe first appears in Supergirl vol. 6 #7 as a girl from Dublin who had immigrated to the United States to start a new life after her mother died, and to escape her father (the also dead Black Banshee). She befriends Supergirl, and stood up to the National Guard who tried to gun Supergirl down, as she could clearly see that Supergirl had saved the city from Kryptonian Worldkillers, but is the only one who can speak her language. She invites Kara to live with her, and brings her along to a cafe where she will perform music, when her dead father, the Black Banshee, attacks, prompting her to transform into the Silver Banshee. It is unclear at this time whether her alignment will remain good.[/quote]