She actually saw the colors as she heard the sounds. My music teacher also was a synesthete. He was a normal guy, though with perfect pitch, perfect rythm and such, and usually everything appeared normal. After about half a year, we were practising a piece that he especially liked, and he got really agitated, and suddenly (because he hated interrupting us) he no longer only told us we were too high or too low, he just injected other criteria like too salty, too sweet, a little too yellow, etc. Not always, but when he got carried away. He knew that he was different, and he always tries to give "normal" directions, but someimes, he had these urges to "fall back" into, what he calls, his "full" self. I've always wanted to be like that. You cannot learn it, unfortunately.
Cheers, Sebastian -- "If it was two men, the non-driver would have challenged the driver to simply crash through the gates. The macho image thing, you know." - Marc Clifton