If I think too much about the colors, they fade away. It's as if I'm seeing them in my mind's eye, not actually printed on the page. Otherwise reading would be extremely distracting.
But "A" is most definitely yellow, and hard-edged! (DD would disagree with me, I'm sure...)
Ruby, I'm pretty sure your dd DOES have synaesthesia. Names are fascinating to me as they sometimes go very well with what I see as the personality of the namee, and they sometimes don't. First and last names also sometimes make pleasing combinations, and sometimes they don't.