How on earth does a girl like that think she's ugly.... whoa look at my pee yellow hair, my meth face, and my.... uh... toilet bowl cleaner blue eyes. That's the most fantastical part of the whole thing
Her reaction was absurd too.
"heyyy you're a foreigner but have a full japanese name, how come?" (completely valid question to start conversation)
"AAAAAAAAA NOOOOOOO STOPPPPPPPPPP"
drops out of school
why? Even if she has some anxiety or insecurity about her appearance, freaking out and at the mere question is quite the exaggeration
look, if you get told you're different and get glared at by literally everyone you meet and then got a nickname like "witch", no matter how beautiful you actually are you will never feel comfortable in your own skin.
She quit school halfway through day 1 and has been a shut-in ever since, there was no opportunity for anyone to say anything about her appearance. She doesn't even know they call her "the witch" since she has no contact with anyone at school before starting the daily calls with the protagonist.
And I seriously doubt she was called different or ugly when she lived in England.