Making prediction is an important reading comprehension strategy and you need to identify the literary theme in order to do so. The theme is the reason why the author has written the piece; the message the author wants to convey through the story. If you know the theme, you can make prediction about how the story will progress.
In the Happy Prince, the theme is that appearance does not always represent one's true feeling; for example The big metal statue of the Happy Prince “feels” the compassion and sacrifices himself for the oppressed.
She didn't want to be the receiver of memories because they made her very depressed and she felt empty so she asked to be released so she doesn't have to deal with more horrible memories, they made her feel alone and that there was so much sad times. She had to face things she has never felt before and it was too much so death was the answer.