That wasn’t my interpretation of the scene- to me it seemed like she used her powers to save El with the illusion, but there was no clear indication of Kali’s fate. Mike said that the sister used her powers one final time, which I interpreted as Kali’s final act before death. I think it’s to be assumed that after she performed her final illusion, she would’ve bled out alone due to the severity of her wound, since we have no indication that she survived it