Okay... judging by the fact that you need help with this question... you probably read the spark-notes version of Hamlet LOL! But that's okay I feel you because I did the same thing.
But basically at this point in the story, Ophelia has lost her mind. She's talking all kinds of nonsense. The reason why is a combination of the fact that Prince Hamlet rejected her. AAAAAAND Hamlet kinda sorta killed her father. But she doesn't know that. She just know's that he's been killed. And it pushed her over the edge.
So the answer to your question is the third option. Ophelia has gone coo-coo for CoCo Puffs.
