The Adventures of the Three Wee Furies — Michael White

The Adventures of the Three Wee Furies is a collection of journeys involving three very young ladies. They have been chosen by their goddesses' Isis and Luna; to resolve some unique problems. Along the way they encounter some young people with very different outlooks on life.
The three girls are Mackenzie, Megan and Paige. Each has a unique talent that they bring to the group. The Furies themselves are excellent warriors and extremely confident. Some skills that require some improving are: compassion for others; diplomacy; temperament; communication and respect for their elders.
Their goddess Isis is a class lady and can definitely help the young girls with their shortcomings. The goddess Luna is the same age as them so needless to say they learn by their mistakes. Their trusted mentor is Grizzly; the Grandpa of two of the Furies. He's old so they have to humour him.
The real adventure is in the friends they make along the way and how they must band together to accomplish their task.