Children does imagine everything and they believe everything is possible. From your post the imagination of the child about the three sisters who got lost in the forest is interesting, the three names happiness,hope and save was their salvation, though they were lost in the forest but they didn't lost hope because it was the last thing to lost, they found save which was independent and financially found happiness. This imagination has introduced a moral and I like the way you presented it. When there's hope and faith, everything will be okay. I wish you all the best of luck.🤗