Focusing on personal growth and courage:
* Be brave, be kind, be you.
* Dream big, work hard, never give up.
* Strong inside and out.
* Shine your own light.
* Always be learning, always be growing.
Emphasizing friendship and compassion:
* Kindness is my superpower.
* Together we can do anything.
* Make a difference, one smile at a time.
* Friendship is magic.
* Spread joy, wherever you go.
Celebrating individuality and self-belief:
* Believe in yourself, the world believes in you too.
* You are unique, you are special, you are amazing.
* Embrace your strengths, learn from your challenges.
* Live life to the fullest, one adventure at a time.
* You are capable of anything you set your mind to.
Bonus Tip: The best motto is one that resonates personally with the girl. Encourage her to choose something that reflects her values and goals.