Oh. Em. Gee. Joining along, and I'm a bit in shock about your MIL. Wowwwwwwww.

But first, CONGRATS to your husband on beating his cancer!!!

That's AMAZING!!!

3 of my 4 grandparents died of lung cancer, and I wouldn't wish it upon my worst enemy. I'm so happy to hear that he's healthy and that you're getting to plan this awesome trip!
But back to your MIL. I have no idea what she's like in real life, but as I was reading, I was picturing her as Marie Barrone from Everybody Loves Raymond.

(If you have never watched Everybody Loves Raymond, look up some clips on
YouTube with Marie and Debra, Ray's wife. You will likely see a LOT of similarities in your own relationship with your MIL.

)
I seriously can't believe she hacked your account and cancelled your ADRs. Like really. I would have flipped.

I'm not married yet, but God help me if I end up with a MIL like that. I will be in trouble because, unlike you, I don't have the patience of a saint. Hell hath no fury than me when someone deletes my Disney plans.

I'm glad to hear that she's no longer joining you so that she doesn't ruin your fun.
On the bright side, I'm happy to hear you got an ADR for BOG!!! That's awesome! It might be at a weird time, but it's worth it to see BOG. Trust me!

You could always just have dessert. Cupcakes for breakfast (which will seriously thrill your kids), you get to experience BOG, and you can grab lunch at a counter service a little later in the day. Just a thought.
And I know you had your heart set on the Grand Floridian, but honestly, the Wilderness Lodge is probably my favorite resort at Christmas. It's beautiful there all year round, but it is GORGEOUS at Christmas. I really think you'll love it when you get there.
Can't wait to hear more as the trip gets closer!!!