A little frustrated

My sister and I have being trying to work out a visit for a while. The only time Emily, Travis, and I could have gone out to visit her in California was over Emily's spring break. Well, Angie didn't want us to come visit then because that was the week before they left for Disney, and she had errands to run and packing to do. Fair enough.
Then we tried to work it out so that she and my nephew could come here and we could do a beach trip during their visit. That was a lot of work and attempting to plan for nothing. She never would commit, and I would find a great deal on condos, and she would never get back to me and then the deals would be gone. One thing that she kept getting hung up on is that she didn't want her son to miss Vacation Bible School. I mean, come on! It's not that I think VBS isn't worthwhile, but I think he could miss it one time to go and spend time with his family and to go somewhere he's never been.
Finally, we decided to just plan a visit and not try to include a beach trip.
Well, in the meantime, Kyle, Emily, Travis, his mom, his cousin and her family, and I have planned a five night beach trip starting on June 16.
A couple of weeks ago, Angie mentioned that they might be able to come here on June 11 for a few nights. I told her, "Well, we are leaving to go to the beach on June 16." She said, "I know."
That was the last I heard of it.
Then, I woke up this morning to two emails. She wants to come out on Friday June 8 or Saturday June 9 and stay until June 15.
So, obviously, I am slightly (and that's true, it's only slightly) put out with her. We couldn't come and visit her the week before she went on a trip, but they can come here the week before we go on a trip? Also, the week she will be here--that's Emily's VBS. So I emailed her back and told her to keep in mind we are leaving town on June 16, so I would have errands to run and packing to do, and also, that week is Emily's VBS. I told her Andrew was welcome to attend. We'll see what happens. I can so see her making a HUGE fight or issue out of this, and I am just going to tell her--we were told NOT to visit the week of Emily's spring break because y'all were getting ready for a trip. Then you would not give up Andrew's VBS to come here, so why should we change everything to accomodate her when she would not budge?
I hope I am wrong and that she doesn't start anything with me.
But do y'all see what I am saying about how she wouldn't do that stuff for me/us, but I am expected to do that for her/them?

Yeah, she is always like this. I always tell Kyle that my sister acts like my life is optional, and that I can just drop everything, but that everything in her life is way too important to be postponed, dropped, or rescheduled.
The other issue is that she wants her kid to be entertained. He knows little or nothing of being a kid and just playing in the backyard by himself or with friends, family, or neighbors. That's what Emily loves to do the most. There won't be a lot of entertaining if they come that week. I mean, how stupid would we be to spend a bunch of money running them all over and going here and there and doing this or that right before we go on vacation? Spend all our money here, entertaining them, and then have little or none for our trip? Uh, no, that's not going to happen. So, she'll have to be happy with swimming and going to the park.

You are right, most all churches do VBS. The Baptist Church (which they attend) does one, and then Methodist and independent churches (like ours) do another. She doesn't want to send him to another church because it's unfamiliar and he won't know anyone, which I get, and I probably wouldn't send Emily to another church unless it's the one where she does preschool, but personally, VBS is just one of those things for us--if it works out to go, we go, otherwise, no big deal. I don't know why my sister acts like it's such a big deal. EXACTLY, Lenora!
Some people just act like they have to be in church or at church every time the doors are opened. We love our church and value our faith, but we also know we don't have to be there for every single thing.