We are preparing for S's birthday party right now. I spoke to nursery and they offered to whittle down the whole class list to mark out the children that S particularly played with.
In the end, because we've gone completely OTT
we invited the whole class and many of our Hitcher friends too. AFAIK though, we're the only people to have done this - S has had only a couple of invitations herself in over 2 years at the nursery, and in fact she's attending one this weekend that I know the children were hand-picked for - no-one's taking offence if they weren't invited though!
So in short, have a chat with nursery, see if they can identify her besties, and decide how many you want to pay for (we have over 30 coming now but I am quite looking forward to the riot, it's not at my house lol!)
Inspired by Sofie, Milo and all my angels, most recently Joe http://www.justgiving.com/JoeDonn/
Ideas and donations welcome x