Ok, so 75mm and you were obviously on the right side of the vehicle very close to her. First time I rode, I was on the wrong side to get anything close. I rode it a second time, and for some reason, my vehicle froze far far back from the witch.
On Monday I stopped in EPCOT for 3 hours and finally went and saw Frozen. Didn't have my camera as I was driving home to South Florida from Atlanta. Next trip.