Definitely!As long as she does not attempt to mimic exclusively Afro-American features (i.e. wearing blackface), a girl of any race can dress as Tiana. Which Disney Princess do you think does not deserve to be an official Disney Princess?
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Costumes are not permitted for adults outside of these themed celebrations. However, if you are not wearing a costume, but are simply dressing in a way that gives a slight nod to a beloved character, that is deemed to be appropriate.
As for whether Elsa and Anna are white … the Northuldra are modeled on the Sami, an indigenous people scattered across northern Scandinavia and northwestern Russia who have faced a great deal of discrimination, but there's a lot of disagreement about the genetic and linguistic origins of Sami to this day.