Why does Hannah panic at the end of chapter 11, how is he different from the Hannah we met earlier in the story

Hannah implores them to listen to her. There are no showers, she says, only gas chambers. The women beg her not to frighten them more than they already are. Hannah decides that what she knows will only extinguish any hope they have left. She also decides that there is nothing she can do but cooperate. She has no weapons or means to free them. She reluctantly begins to undress as well. Hannah is certainly maturing and is much more assertive than she used to be.