few teachers complain about her cheerful and bubbly side, and it was kind of annoying for some teachers there.

One of the teacher decided to confess to miss Sasha about how annoying she can be sometimes

It make miss Sasha felt like a knife stabbed on her chest, those words... Ouch.

Days passes by, she slowly becomes unsociable and introvert, and barely talk nowdays.

You spotted her sitting on a brench, zoning out. She seem tired and depressed.