When she was looking for her son, when the tide was in, she saw him in a cave. He wasn't dead at this point, he died soon after, that was what the banging was later on. Her son trying to escape because he got locked in the cellar and when she knocked the stuff over in the cellar and put it back she put it back over the door. However, the ghosts helped her get to her child (10 months too late but better late than never hey?). I suggested in class that there was a secret tunnel to the caves from the cellar and this also suggests that that's where Tomas' footprints went off to at the start, this was dismissed by everybody though for some reason :\
So to me, if there wasn't a secret tunnel then I think she was haunted and she was mad at the same time. If there was a tunnel then I think she was haunted. BUT then again, her husband didn't see him in the cave when he was obviously still there to him. So yeah, it must be a combination of the two or she was completely mad but like really really mad with a lot of blackouts and she realised her son was in the cellar beforehand but forgot it and she lead herself to the cellar with the clues.
None of these seem very likely though :\
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