Thanks for the update on Echoe, so she does not allow any touching, well some greys are like that and you have to respect her feelings but otherwise she seems like she is a normal fun loving grey.
She may just be pulling the ones that were going to fall out anyway and it is normal for them to chew them after falling out but keep an eye out if she is plucking.
I would try to discourage giving her too much junk food, a little taste now and then isn't going to do any harm but not on a regular basis especially daily. The popcorn even if it is the air popped kind still has fat in it and very little in the way of nutrition, offer her some more veggies.