With the way Sophie treats her, it's not really surprising. She treats Cindy more like a servant than a friend when she's in a foul mood.
She just humiliated Cindy in public even though she didn't do anything. It's like her better background entitles her to behave so arrogantly. Even if she didn't mean to, Cindy obviously didn't take it well…
This must happen a lot, Katrina realizes. If Sophie treats Cindy like this all the time, it's no wonder she secretly feels this way.
Realization dawns on her face. Cindy always defers to Sophie, but she must be plotting against her in secret. Sophie needs to watch out for her.
Should I warn Sophie? She thinks, picking up her cell phone. Despite everything, she's still Uncle Anderson's daughter. Whatever Cindy plans to do, I don't want to see something bad happen to her.