It's not her fault the sounds she makes are similar to mocking laughter.
Hey, are you okay?That rabbit was very mean.She's a liar and a bully!There, don't cry.It doesn't hurt anymore, does it?What's it doing?Is it happy...?It's pissing me off, actually! Is it making fun of me!?Now, now, it's just a kid...Hmm, yeah...She was a weirdo anyway.Now I'm mad! Let's go, Chen!Gera Gera
(It sounds like derisive laughter, but it's just her tic)