"But the difference between Emma Watson and Miley Cyrus/Lindsay Lohan/Vanessa Hudgens is that she’s too well mannered to let it out. Emma Watson stayed in the game. She was present. No exasperated sighs, no eye rolling, no curt responses, no darting her focus around, no fidgeting from boredom. Instead she went into detail about Hermione and Ron, she gave a great answer about the Deathly Hallows, and when I turned the conversation to fashion she totally lit up." from Lainey Gossip
She has improved a LOT with the junkets since being a cute, somewhat precious, obviously sleep-deprived little girl. Here is a clip of little Emma doing the NYC junket for SS/PS from the end of the day of junket interviews. She looks exhausted, and is ironically exactly what Lainey is talking about with the other stars, playing with her chapstick, heavy sighs, eye rolls, sounds exasperated at times; except she's 11! She's really grown and matured and it shows so much in how she handles the stress of promotion.
Video:
YouTube - Emma Watson Interview - Philosophers Stone (IGN)