Twister freaked her out a bit as well...not at first, but during the final scene (we were front row).
I think the fact we'd just done Twister, and then this creepy queue (after stopping to take pictures with the "gangster cars" was just a bit much, a bit soon. I probably could have gotten her on it had we circled back around later...
But, I never forced her to do things she didn't want to do, and never would, so even though we had to backtrack through 3/4 of the queue line (with people looking at us with evil eyes as if we were the devil for making our way back), no way would I force her into it.
We went and got a snack and headed over to MIB (which she adored).
The only other thing we didn't make it through was the queue for Poseidon's Fury...but that's just because...as well themed as it is, it's incredibly long, and she suddenly decided about 3/4 of the way through she needed to go potty...and go potty now. So, we left. We weren't the only ones who did though, and it's not the first time I've heard of people backtracking out of that queue...
It's hard to say why, without having done it, but it seems to me that whole show is broken...needs to be revamped.