Christ, just say it, she sounds very odd if she thinks you need all that silliness when you're busy moving!
I'd phone her up and just briefly say "Look I'm sorry, I know you've made all these lovely plans but I'm afraid we can't do them, I'm too tired and busy with the move, I'm dreading it as it is without extra people in the house to deal with. Sorry."
Better than giving excuses which she could work round. Just stick to your guns and say "sorry, but no" - she'll respect you more for it in the long run. Eh, maybe not so much in the short term...