I also feel bad when I hear parents cussing out the CM's for "catching" them. But, I didn't think the OP was trying to cheat.
I agree with the earlier poster, make sure she stands up straight...my kids are slouchers....when I measured DD13 for a bridesmaid dress I was making, I had to remind her 10 times that if she didn't stand up straight the "floor length" dress wouldnt be!!

And with strangers, your DD might shrink away from the stick, as someone mentioned.
My DD2 was extremely disappointed she couldn't ride EE or TOT.

And she is barely 32" tall!
I wouldnt' mention riding the rides....then, as you approach them while there....say brightly, "Hey...I am not sure if you are tall enough yet, but let's try!!" Then if she makes it...SCORE!!! If not, go for a Mickey ice cream bar...always makes me feel better.
It is tough, my DD13 was tall enough long before DS11.....he was always so bummed out.