Her eyes are normal without any defects. But, she tried to roll her eyes' pupils into either the left or right corners of the eyes on purpose as showed in the picture.
Do we say "she is squinting her eyes"?
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In addition to Jack's answer: apparently "squint" in medical terms does indeed mean a medical condition where someone's eyes look like that all the time, but I don't think that's very common in ordinary English.
Anyway, even then we wouldn't really say that these people are "squinting their eyes", we'd just say "they're squinting". It would be a bit like saying "smiling their mouth" (which is not correct).
British slang term for being Cross-Eyed.
"crossing your eyes" sounds most fluent to me.
I've never heard "looking cross-eyed" before, but I can tell what it means.
"rolling your eyes" means to look upward, not toward the nose.
"squinting" just means closing your eyes a little bit while looking at something. It is body language that people make when trying to read something small.