Either gaslighting, or KP had taken a lot of acid that day.

Did she really? The ranting is a bit manic, but the incident she describes is some full-on *ahem* Regina George grossness.

They were/are muppets...

Seriously, say what you want about Katy Perry but lay off puppets.

I love puppets. They helped me learn my ABCs.

Likely just a semantics issue: The CT scan was used to rule out other issues, resulting in a diagnosis of concussion. And SI used slightly inaccurate shorthand to express that.