I would have to say this is bcuz of casting conflicts, I mean in Holloweentown the 1st she was playing a 7 yr old but she wa sprob really 10 and in the 2nd one she wa going on 13 but she could still pass for an 8 yr old but in the third one Holloweentown High she was prob really 15 and playing 13, lol so now she would be 17, wow, lmao
Actually she is 15 years old now and when Halloweentown High was filed she would likely have been 12/13, 9/10 for Halloweentown 2 and 6/7 for the Halloweentown (her actual ages, not movie ages)