She's going to have to be, because until she chooses her token Hispanic she has zero credibility when it comes to Immigration. I mean none.
The national opinion on immigration is fairly centrist, so I don't see the advantage of the Democrats pushing further left on immigration in any way. The Republicans have more to gain there than the Democrats do.
It doesn't matter if that's the case, what matters is the math. Republicans cannot with elections with all white voters anymore. They'll absolutely need to get to 40% hispanic vote like Bush 43 did in 2004 to even have a sniff at the Presidency.
Hillary can ride the coattails of her husband in the black community and Obama's coattails with the hispanics (executive order).
The centrist opinionated people you refer to, are more warm to the idea of a Clinton 3rd Term, than a Bush 4th term. Especially after Jeb's Iraq blunder this week.