How to help someone who is infatuated with a famous individual?

I think she needs to talk to somebody. You might try telling her just what you said; that's she's just not the same, and the infatuation seems unhealthy and you're worried about her. She may be more upset about her parents divorce that she's letting on, or she may have another reason. A lot of people are really hurting inside, much more than their friends know. This obsession may be a way of escaping and coping with that. Doesn't make much sense when she says it's easier to get through the day without thinking about him, but is still saving money to go see him. Maybe you can get her to open up to you, and then you might be able to persuade her to see a therapist who can help. My guess would be that there is something making her really unhappy, or stressed, and this is her way of escaping that. I don't know what advice you can give her, but you may be able to help her by encouraging her to talk about her real feelings.