"She is a very sick little girl, but very strong, " she said.

CNN: Croatians raise money for young girl's treatment in U.S.

"She is powerful, but she is also a sweet, creative, loving little girl who wants to help others and work for others, " Jolie said.

CNN: Malala's first grant will educate 40 girls

If you ask a little girl what is your dream she would say to play Maria Sharapova.

BBC: Heather Watson loses to Shuai Peng in Auckland quarters

But today, somewhere in the Midwest, there is a little Asian-American girl with the crazy idea she could be president one day, and because of Obama, she knows that idea is not very crazy at all.

CNN: How Obama made opportunity real in America

As to what else Kennedy can do with her high profile and the unique and powerful celebrity status she's held since she was a little girl in the Kennedy White House that is a question that people never cease to ask.

WSJ: Caroline Kennedy returns to poetry for 10th book

The outcome of the treatment is uncertain, but Mrs Clark said she had been given hope by the story of a little girl from Northern Ireland who had gone for the treatment only able to see light.

BBC: Stem cell appeal reaches target