And here's another example why, written by my 9 year old after being instructed in her English book to 'write a thank you note to your  teacher for helping you'. It goes:

Dear Mrs. M__________ (me, her mom, too cute!)

Thank you for always teaching me. And thank you for helping me, and loving me. Your hair always looks great. Your clothes are pretty and your earrings are beautiful.

Sincerely,

Anna

Definitely written by a girl--I love it!