This show is aiming too much on the shock factor and it's all becoming a huge pile of MESST.
I wouldnt be surprised if at the end, aliens had abducted Ali and made her evil, and made her mess with the girls to see their reaction. They wanted to test how humans would react or something.
Tbh, i can see them going with a direction like that. After all, they want us to be shocked to the ground, not believing our eyes. They dont care if it makes sense, or not.