Yes I have some ideas. I've raised two girls and two boys and enjoyed putting together fun, memorable yet inexpensive parties.
One was a ballerina party. They all wore tights and various outfits. I remember bringing out a bunch of scarves. I put on some classical music and they all 'danced' (sorta). They all took it to heart and were very serious and also giggly about the whole thing. Play, Pin the crown on the babllerina. get some ballet books from library for everyone to look at. also, check out some ballet movies and show a clip or two.
another one was a doll party. They each brought their fav doll,at the time, most of them brougth american girl dolls. I set up a small breakfast tray on the floor with a couple small tea sets that our girls already had and put all the dolls around the teaset for their very own tea party.
High teas were one of the favorite parties I had for girls. had several for them, starting at four years old. Key to this with younger girls is smaller party. I think I had about six at first four year old party. the girls LOVED dressing up, wearing pearls, their best shoes, etc. Used glass plates. Always did this and nothing ever broke. of course, i didn't use best china. served tea with lots of milk and sugar or allowed girls just to have milk in their teacups. made table fancy. the 'ladies' acted accordingly. menu: tea sandwiches. had pbj, cream cheese and strawberry, honey and pb; might have had one tradtional high tea sandwich like chix or egg salad. scones, shortbread...which i have the easiest and best recipe if you want. some simple, non messy fruit, etc.
Well, there is a beginning. if you decide on one, I can give some more ideas for it.
Mainly, decide what kind of theme your daughter likes.
hope these are helpful.