R.F.
OK - you made me cry. I think it's a very bittersweet day. 1) she totally confided in you 2) she's growing up.
Do something really special for her. I cried when I got mine because I thought I wouldn't be 'daddy's girl anymore. Luckily, my dad came to me and gave me a great big hug!
Still crying! Ha! Just wait until my daughter starts hers (she's not even 5 yet!).
Also - wait til you are both on the same cycle and crying/screaming/PMSing at the same time :)