the most obvious and most important symbol in this fairy is certainly a frog.
In general frogs brings good, although it can be connected to witchcraft. On symbolic level it is widely used and is in most cases connected with fertility, new life and optimism. This probably comes from ancient times and observations of first scientists who noticed frogs appearing 'out of nothing' on first warm days. They didn't know about hibernation and transformation, so these animals made pretty magic impression.