@liminalia,
I would ask (maybe the boss is unaware or at least is playing it that way), e. g. "This looks like a curriculum I saw here. Do we have permission to use this?"
That's a straightforward question right there. And see whether she sweeps it under the rug or blames the intern (that's often what happens, particularly if the intern has left the company) or says something like, "Damn, we shouldn't do that. We need to rethink everything."
Of course you want the latter, but at least that will give you an idea of the future, and whether you want to continue in that environment.