Need Help.

it was because, the book is told by bellas point of view so when she is going through all the emotional pain the reader picks up on it as its what she is thinking all the time. but in the film there is an actress there playing bella so we can't "hear" her thoughts like we can in the book so the narrative is played out as emails to alice... she writes to alice what she was feeling in the books

I'm not sure

because Alice is her best friend, I don't know why she didn't send them to her mom, probably sent them to Alice to help narrorate the movie.
(when bella said what the emails said)

well im sorry but i havent seen the movie new moon yet im a big fan i have two posters and a book im about to get two dolls a bag with a blanket a pillow and a charm bracelet i could go on and on but im new i just joined a minute ago and i need help with all of this