A few things:
1) She supported TPP in its form when she was still Secretary of State. She's been out of that office for years, and the TPP has changed substantially since then. She obviously wants to review it more, and perhaps change it substantially, before it's ever implemented.
To be clear, this is more wishful thinking and mild projection and
not generally reflective of her views. There are some general platitudes about it not meeting her "gold standard", and some caveats about free trade and globalization in general, but nothing on the record (as far as I'm aware) about changing specific parts of it, revising it, or much of anything else. Just that it doesn't meet her standards in the vaguest sense, and some desire to implement domestic measures that could offset the negative externalities of the TPP. Also, you can't just revise it without having to renegotiate the thing with the other parties, and she's made no indication of wanting to do that.
Is it complicated? Sure, but she's a capable person, an alleged policy wonk,
it's done and can be read (especially if you have a staff), and it's well within her ballpark to understand it. She was, after all, plugging it as SoS.
Moreover, for someone who's perpetually eyeing her base, she should be well versed to discuss it in depth, given the hostility to the deal among a significant portion of the Democratic electorate. Instead, she largely ignores the issue, and for plenty of likely reasons: not to alienate corporate donors, to avoid reminding Sanders voters and progressive voters about her flip flop and tepid opposition on it, not to be seen campaigning against a key initiative of the current administration, and because the media literally almost never raises the issue. She can just toss out generalities in the interim, and hope it gets passed in the lame duck session, as is likely, and wash her hands of the whole affair. Ditto TTIP by and large.
Also, this:
Politifact said:
Its up to voters to decide how they feel about her changed stance on the Trans-Pacific Partnership, but we rate Clintons reversal as a Full Flop.