Last I recall, her claim has always been to be able to actually see inside the human body, hence the "Vision" part of her screen name. She's claimed to be able to see down to the molecular level and that some molecules or atoms appear a particular color, and she's also described the colors of some organs inside the human body, but that's the only references to colors I recall.
That's why she was tested on which side the kidney was on. Not only did it increase the odds without having to find more subjects, it was perfectly in line with what she claimed to be able do.
In retrospect, the biggest flaw in the test was that a wrong answer could seem dramatic, due to the two-step announcing process, which is why the sharpshooter's fallacy is so tempting.
As far as her saying she's just learning about her abilities, that's part of her way of manipulating people to keep them interested. It works on new people who haven't followed the whole history of her self-investigation. Here's
my take on it.