Supergirl Returns and Puts Lena Luthor in a Dangerous Position

In addition to the threat still posed by Cadmus, Rhea's arrival at L-Corp with a proposition for Lena in the final moments of the episode can only mean one thing: big, bad things are coming.

Will she choose to ally herself with Rhea out of a desire to make people suffer the way she has suffered?

Or will she remember what Kara said, when she promised to always be her friend and protect her?