well, he recently started the 6th book, and this will be the first one that she hasn't seen the movie of in advance, so she doesn't know the story. she doesn't know dumbledore dies. when they get to the 7th book, she will have to deal with one of the twins dying. and lupin and tonks. i feel so bad, because she doesn't know what's in store. something she loves so much is going to turn on her.
she knows someone dies, but she doesn't believe its any of the people above, because they can't die. she just thinks the books end with ron married to hermione and harry married to ginny (someone at school told her that's how it ends.) she doesn't realize everything she's going to have to go through to get to that last chapter. poor little girl.