Alexa's feed

I'm not quite understanding this anymore. Sometimes is the evil Iliana (the one who tortured Magnus) and sometimes the Iliana we get to know at the beginning, so I asume our Iliana died in the fire? So it looks like the bad Iliana recovered her body (because let's be honest. It doesn't matter how many trauma she got from her father, that's no reason to kidnap someone for her beliefs) and took the pieces the first Iliana left, like Magnus falling in love with her...