I think this is a pretty calculated move that is designed to provide confusion on a number of fronts.
1) I think that she realizes that even though the Democrats will probably win on Amnesty in the near future (with more than willing help from the GOPe leadership), that won’t happen until after 2016 so the Hispanic vote isn’t who she’s going after as a ‘voter.’
She is going after that Democrat - the one who used to be called Reagan Democrat who feels strongly about sovereignty, etc. She has calculated that they outnumber those Reconquista Hispanics who will be influenced by an impotent endorsement of this “child amnesty.”
2) By co-opting this position before any RINO with balls enough to do so, or most any viable Conservative for that matter, she ‘owns’ it, and she will have that for the next two years as her bona fides on tough immigration. Frankly, there isn’t a GOP approved hopeful that will even touch that position. And, besides, nothing in history - nothing - says that once spotted, the Democrat leopard won’t change them when convenient and appropriate.
3) Benghazi, her book sales, all her baggage will take second tier to this position even if the media had enough integrity to question or investigate like real journalists.
We have heard stories that ICE is reuniting them with their illegal families in the US. You must always parse what Hillary says.