>>46773335There is definitely some autotune that is done at some points, but most of the vocals (the singing parts) sounds very similar to what she's done in (nervous and drunk) karaoke sessions live, especially when she sings Evanescence. As for the screams, in the original there are two vocal tracks during the sequence, one is Courtney LaPlante, and the other is someone else (probably a man by the sounds of it). Froot's version follows that, so you'll hear two "scream" voices there, and while it is somewhat hard how much of it is Froot, if you listen close you can tell she's definitely doing it.
Either way, for a first cover song it is quite good and people seem to be in consensus that it is.