Stephenie sagot this on her website,
link [Copied and pasted from her website]
"How come Alice and Jasper can affect Bella with their supernatural powers, but Edward and Aro and Jane can't?
This tanong comes up at every single signing! The answer is explained in Eclipse, but I'm going to tell you all anyway, just so there's less confusion.
Bella has a very private mind. She can't be touched there. What Edward and Aro do is clearly a mental thing; Jane, also, works inside the head (Jane doesn't actually inflict pain on anyone's body, she just puts the illusion of pain inside her victim's head. It's a very effective form of torture). Conversely, what Jasper does is no illusion. He affects the physical body, slowing the pulse and upping the endorphin levels to calm someone, for example, or raising the pulse and pumping out the adrenalin to excite them. Alice, also, works outside the mind in the realm of possible realities. She doesn't see the thought process behind the decisions, just the outcomes." 
