There are many wonderful stories surrounding St. Colette - that happened to her and many others she did for others: cured a Dominican nun that was a leper, raised the dead, etc. Below are just two of these stories, shortened.
Forget the "Mary had a little lamb story", children should be told of how St. Colette had a lamb that followed her around and prayed with her!:
Birds flew about her, and a lark
drank from her cup, while a lamb trotted after her and
stood quiet in her oratory while she prayed.
(St. Colette and her little lamb.)
Colette's "tiny no more" story:
Colette was nearly grown up,
but at sixteen she was no taller than she had been at
ten or eleven.
"You are so small that you will never be able to keep
the house clean when your mother dies," remarked her
father one day, seeing Colette in vain trying to lift
something from a shelf that was out of her reach, and
though the words hurt her the girl knew that they were
true. What would become of them when her mother died?
and she was nearly sixty now. Night and day the thought
 troubled her, and at length she resolved to go on a
pilgrimage to the shrine of a saint not very far from
Corbie to ask for help, as many of her friends had done
"Let me become tall and strong," she prayed, and tall
and strong she became, to her great joy, so that when
her mother died she was able to take her place and do
all that was required of her. St. Colette was small on the day of her departure to this pilgrimage shrine and on the day she returned, she was much taller! God granted her prayers.
(A Franciscan friar listening to tiny Colette preach - before her miraculous growth spurt! Her little friends helped raise her up.)