http://www.hollywoodreporter.com/live-feed/supergirl-how-kara-affords-her-848172

Showrunner Ali Adler has come up with a backstory that includes Kara getting a break in her rent. Plus, she doesn’t need to worry about the area she lives in. PLUS: Inside Supergirl’s Martian Manhunter (http://www.tvinsider.com/article/60082/heres-how-supergirls-hank-henshaw-became-the-martian-manhunter/) reveal.

I don't see anything in the article that explains that most about the boss or some guy being alien r something then some article about why kara need glasses.

she picks up some extra cash on weekends moonlighting as a forklift.

When she can't as a welder, which pays more.