Thank you for all your responses. I wanted to clarify why we're not going.
1. DS 10 is not friends with this girl. He only has 1 really good friend and kids from Scouts who are friends with him, but he is an awkward ADHD+ (we're still working out what the + is) kid who doesn't make friends easily because he's unusual. He is teased constantly by his classmates who try to get him angry to get him in trouble, etc. He is the child that remembers daddy slapping mommy and all the emotional turmoil of our family situation and the divorce. DS 6 was 10 months old and DD 8 was 2 when I left a nasty situation.
2. My other 2 kids (DS 6 and DD 8) are not invited and I would need to make alternative arrangements for them with my parents, who are not available. They are already taking DS 6 and DD 8 for me this weekend.
3. I'm a single mom and while I would normally have the money to make such a trip, I've been making monthly payments on our own trip to Disney Labor Day weekend (our first family vacation since the divorce 4 years ago). I am also taking DD to Kennedy Space Center this weekend to attend Salute to Girl Scouts. That means a 2+ hour drive, hotel room, tickets, and food. My entertainment/travel budget for April is shot. I also have to sign the kids up for summer daycare tonight which is a $150 deposit.
4. The invitation only included a map with driving directions. No mention of carpooling. I've never met these parents and I suspect that the birthday girl involved is in daycare with my DS and isn't very nice to him.
5. What surprised me was that the parents would ask people to drive that far. I could understand driving the 30 minutes maybe to reach the nearest Chucky Cheeses or to the Homosassa Wildlife Park which is 15 minutes away, but most birthday parties around here are local (bowling, roller skating, park)
6. Trust me. I WANT to go, but have already made plans that I can include all 3 kids with and they are plans that are within my budget. What I was questioning was would they be allowed to invite all those people to come to the pool or does the Beach Club offer parties like that?
Thanks. Beejie