My wife's phone just did something weird, everything is in negative color. I thought it was a theme, but couldn't find anything on her phone. I emailed myself a screenshot from her phone but when I viewed it on my phone it was ok.
See if she went into the Settings app and selected Accessibility -> Display -> Color inversion (or a similar setting (your might say "Negative color", etc.; it's one of the last options on my device).
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