"What do you mean?"
"It's hard enough for them, having to share all their thoughts. Most of them try to cooperate, make it easier. When even one member is deliberately malicious, it's painful for everyone."
The only female werewolf doesn't help the pack. She harms them because she's too emotional over losing the love of her life, Sam, to her cousin, Emily.
This is the worst book of all time.
For more on the subject, see Sexism in Twilight Saga and Romance in Twilight Movie.