Anonymous wrote:just tell her it's local friends only. that you didn't want to ask people to travel.
my guess is that the two girls from out of town would not want to come anyway. You say they both have husbands, and at age 40 I would guess they have kids too. Planning a weekend trip at that stage is a lot of work, and once they get to the party, they won't know many people there anyhow.
unless they are unusually pissy, or there are aspects of the situation you are not sharing, I don't expect them to be offended that they weren't invited. they probably prefer not to come.