I think this is such a lovely idea for your daughter. How about a lovely tea? Chicken salad sandwiches (or cucumber or whatever little dainties sound good), light salad, petit fours, tea (of course!), everyone dressed up nice.

Maybe not so much state "My daughter's started her period!" but more like "My daughter is becoming a woman" and maybe go through the circle and have every woman say a wish/hope for your daughter and a small piece of advice. Example: Love your body. Don't let anyone tell you any differently! (Unless that anyone is a doctor! or midwife, you know what I mean!). I hope you have the opportunity to travel the world.