Asides from being massive fans of alliteration, the Luthors are pretty downright maniacal, and most of Lena’s storyline has been about escaping from that shadow.
Even though Lena helped but her mother behind bars, it’s difficult to shake the negative connotations of the Luthor name.
In an upcoming episode of Supergirl, Lilian Luthor — Lex and Lena’s alien-hating mom — will break out of prison and all hands point to Lena assisting her.
Believing in the inherent goodness of others is a core trait of Supergirl, and Kara will have to stick her neck out for Lena to prove her innocence.