Kara was essentially a single penniless teenager mother stranded in a strange country with no food, baby or fresh clothes... and even so she was loath to stealing.
Upon examining the crystals, Kara finds out the only reason because her uncle built a rocket for her was because her parents argued she could look after his son. After discovering this, Kara wants nothing with her biological family other than little Kal.
Alex declares a movie night which unfortunately is a disaster. Kara is frightened by horror movies, thinking they're real. Then they start watching Star Wars: A New Hope, and Kara is quite fascinated... until they get to the part where Alderaan blows up. Kara dashes off and throws up.