I am staggered by this thread, tbh!
I firstly can't quite believe that you contacted the feeder nursery to ask for the class list, and then invited children your DD hadn't met to a party. Then seem upset that it hasn't led to a rash of invites.
And as for the original issue, your DD has been invited to the party of her 3 best friends, and you think this is a bad thing?
I really think you need to chill out.
My DD didn't have a party this year (3), she just had 3 friends to play, and they were offered cake when they arrived. And she still got presents from them. Not that it mattered. It was so much better for her to enjoy her friends than to be the subject of a big party.
Less is sometimes more. Presumably, these girls are friends with mostly the same people anyway. Why duplicate?
And I think you might want to revise your statement about FAQ's world being different to everyone elses. 160 posts almost exclusively saying that you are barking up the wrong tree here, I suspect that it is your world that is different.
I hope your DD enjoys the party.