When did Audrey say this quote?

"I believe in pink. I believe that laughing is the best calorie burner. I believe in kissing, Küssen a lot. I believe in being strong when everything seems to be going wrong. I believe that happy girls are the prettiest girls. I believe that tomorrow is another Tag and I believe in miracles."

When did Audrey say this? I have had a hard time trying to find the Quelle of this quote. Was it in an interview, book, oder movie?