The Fool, at the beginning of her journey, is the archetype, "child". She is free-spirited, pure and eager. Her message is one of eccentric choices. She lives in the moment, always curious and full of adventure. The Fool is not concerned about when or where the journey will end, for it is filled with wonder and infinite possibilities (0). For this reason, making it the "0" tarot card makes sense.
Some tarot card readers consider The Fool to be associated with the element "Air", while others say "Earth". Associating planets to tarot cards is discretionary to the individual reader. It is said to be associated with the planet, Uranus. If and when I do it, it'll because of the synchronicities, because it's fun and because it makes sense to me.
It looks like the cat is trying to pull her away from the edge while she's enjoying herself trying to catch the butterfly without considering the risk of falling over the cliff. She doesn't have a care in the world.
The butterfly is the symbol for birth and rebirth. Also freedom and flight. Read The Fool's Journey to help you understand the synchronicities with the "Death" tarot card, in addition to the "Fool" card.
Love and Synchronicity,
Diana