Well, it seems rather final. But without more details, it's hard to have a deep opinion. It could be a great ending if it wrapped up a long and complex tale neatly.
Well, it could be quite satisfying if it brings a sense of closure. If the main character has achieved their goal, whether it's finding true love or saving the world, then it's a fulfilling end. However, if the ending feels rushed or if there are unresolved plot points, it might not be so satisfying. For example, if a story about a journey has an abrupt end without any conclusion about what the character has learned from the journey, it would leave the reader feeling a bit cheated.
Maybe. Sometimes the end of a story can have deeper implications that are not immediately obvious. It could be a metaphor for the end of a phase in life, or a symbol of a lost opportunity.
Maybe the story is complex and your child is taking time to understand it fully. Some stories have lots of details or difficult words that can slow down the reading process.