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See the "Criticism" section of that same page and the subsection of "White Hispanic and Latino Americans".
I think the criticism in this particular case is that she identifies as Latina despite being born to white english parents and living in a Latin country from the age of 4 to 6 rather than people claiming that Latina people aren't people of colour. I mean, her Dad was granted Argentine citizenship after she left Argentina.
https://en.wikipedia.org/wiki/Person_of_color
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In the United States, people of color include African Americans, Latino Americans, Asian Americans, Native Americans, Pacific Islander Americans, Middle Eastern Americans, and multiracial Americans, though members of these communities may prefer to view themselves through their cultural identities rather than color-related terminology.
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So, by identifying as Latina she falls into one US definition of "woman of color".
See the "Criticism" section of that same page and the subsection of "White Hispanic and Latino Americans".