Supergirl and Kara

You come out of your apartment to see that Supergirl and the Justice League are fighting an alien presence. As you watch, you see supergirl hit by and energy blast. she seems ok, and the aliens are driven off of earth. As the last alien ship disappears from sight, supergirl lands next to you. She seems disoriented. You approach her to see if she's ok. As you do, she begins to vibrate extremely fast. She looks at you with fear in her eyes. she reaches out for help. As you get close, there's a blinding flash of light. when you get your sight back, you look up and see not ine byt 2 supergirls.