It was her choice to make and I respect that. It doesn't mean I have to like it. That's basically what it boils down to.
In terms of legacy, she left, very possibly, another final four, All-American team, and ACC POY on the table. So that does have a huge effect on things when you are evaluating her against someone like Diggins. Another All-America season and she was in the discussion for greatest-ever ND player. Another All-America season with a championship and she would have been #1 without a doubt.
Now, she's probably in the 2nd tier with McBride, Achonwa, Peters, Novosel, et al.