Hey there old St. Nick, given the circumstances I would take Steve's approach and try to figure out the paradigm of the reader first. Clearly changing colors is significant, not ordinary, and the colors may mean different things to her than they would to me. Maybe you should just ask her, haha.
It's important to take it from her perspective because the information she gathers comes through a lens that she has crafted through practice to allow her to understand the world around her. Each color will have a unique significance to her based on her associations, which could be very different from mine. That's because the colors here are not objective: blue doesn't signify a wavelength on the upper end of the visible light spectrum, because what she's "seeing" isn't actual light. Instead they're subjective, associating themselves with meanings that she happens to ascribe to particular colors.