Interesting but falls apart in the last minute
I was really enjoying the ride: at no point the balance was tipped more in favour of "changeling, and the villagers know well" against "maladusted, abused, autistic kid and the villagers are just ignorant". Daisy doesn't do anything *supernatural* all through the movie; she is violent, weird, upsetting, you could even say evil, but I didn't see her fly through the air, and you didn't either. For 90 minutes I thought this was a very intelligent thriller, the old ways vs the new ways, lost traditions, stuck-up townies.
Then suddenly the new baby is perfectly clean and healthy and washed in his cot. Umbilical cord cut and knotted, presumably, as there is no blood anywhere.
Even the fact that Daisy physically hurts and probably kills Martha was still ambiguous (fairy murder or unadjusted-child violence?), but sorry, she's a feral kid, how is she supposed to know what to do with a bloody, screaming, slimy newborn?
Therefore I believe she is a changeling, and my whole interest in the movie collapsed in the very last scene. Clunky, clunky writing for lovers of cheap thrills.