I don't think so at all....she has a mediocre jump shot (from deep and midrange), she's a poor decision maker, and doesn't do anything phenomenally well besides her great athleticism. Volume shooters with low efficiency rarely make for great pros, and that is a difficult habit to fix. She's a great athlete and has a pro frame but the skill just isn't there. Her track record doesn't indicate that she's a team first player and she hasn't improved much at all since her freshman year. I get it, wings with her skill set (great frame, good ball handling, ability to create her own shot, overall athletic ability, etc) do not grow on trees, but she hasn't shown anything that makes me think she can be one of the best players in the league.
Her situation reminds me a bit of Kara Braxton's...I remember in a game Doris Burke stated something to the effect that Braxton had the ability to be a league MVP with her size and coordination, but her drive and attitude were holding her back. Diamond could be a great player but she is definitely a risky top 3-4 pick with her unpolished skill set and track record.