You should add it in the written portion of the review. The profile is set by the first reviewer. So it has nothig to do with the provider being deceptive. The first reviewer probably categorized her in what he thought was the best category. Perhaps he felt she was mixed but mostly white. What does she say she is in her website or ads?

TER should put "mixed" as well as other categories in the ethnicity section, but until they do, we can only use what is there. So checking off one category, then writing the actual description in the details is the best way to handle it currently.