I knew this was coming.
Perfect pitch does not mean one can sing or play the violin.
It just means one can hear tone pitches better than most folks.
As an example: Regretfully, Susan Boyle is having some emotional problems, but she has perfect pitch and can also sing.
It wasn’t excellent, but it was better than me!
No, it means I can say to you, "Sing me a G#." Or, "Sing me an E natural." And you can do it right on the beans without hesitation or any kind of hint.
Perfect pitch and a highly trained sense of relative pitch are two entirely different things. Perfect pitch is EXTREMELY rare.
OK, so then how do you know she doesn't have perfect pitch?