Awwww... I'm so sorry.
This has happened to Josie her first time. With Jojo I was ready for it. Make sure you keep telling her how gorgeous she is. It will definetly make her feel good about herself.
It will be okay- and yes, I promise it will grow back. I cried so bad for Josie too. Make sure if she goes back, you clarafy next exactly what you would like. Pictures are a helpful tool too.