The only thing I would contribute is to make sure that the little bag of necessities you give her is something like a funky makeup bag with a zip...waterproof and spillage proof and discreet.

My mum was too cheap for anything like that and gave me some pads in a brown paper bag to keep in my school back pack (the old surfboard style pads that had no wings and no funky discreet individual wrapping). The paper bag was getting ripped so I put in the side pocket of the backpack (not an easy fit) and one day it fell out and the paper bag opened and everything came tumbling out and I was mortified. In front of the boys too.

Re deodorant...you will know when she needs it when she starts smelling of BO. I actually had to start wearing deodorant in kindergarten/prep and once again Mum went cheap on me and got me a roll on. I didn't like feeling wet and icky under my arms so I would try not to wear it and then Mum would tell me I smelled...it really wasn't the best way to make me wear it (especially given that I was very embarrassed because I knew nobody else in my class was wearing deodorant). So if you do pick a deodorant out make sure it is a spray or one of those white solid sticks that aren't wet.