"...I-I was not looking for gh-ghosts!" Beatrix protested hotly, arms flailing wildly, "I-I'm a genius! I know tha- that ghosts don't exist at all!"

It was necessary to emphasise this, because having this girl spread lies to her friends was a terrible thing. Imagine, mere peasants believing a silly lie that made herself look bad! Beatrix would stand for such things, so she was going to gracefully set the record straight.
Regaining her composure, the small gothic lolita folded her arms, puffed out her chest and smirked in a smug, condescending manner, "silly children, I hope you don't believe those silly rumours, too!"

She pointed to the empty, hopefully-not-haunted alleyway, "I was... I was merely watching the people stupid enough to believe there was one! Because they're stupid! And that's funny!"
She glanced between the two girls, and continued, "only dumb kids think ghosts are real anyway! You two must be way younger than I thought!"