Most unhappy people are that way because they had unrealistic expectations about life in general. They think because they are smart, that things are supposed to fall into their laps. One of our attorneys, who makes less than I do is one of the happiest people I know. He went to Marquette and didn't try very hard and is happy just to work and be able to do some of the things he really likes without being tied to our firm 80 hours a week (our lawyers work 50 on average).
I will definitely make less after LS than I do now, but I feel that making a contribution to society in a greater way than I do now will somewhat make up for it.
Money does not make you happy. Experiences do. Friends and family do. Don't make this woman feel bad about her LSAT and grades...her dream is to go to law school. Realizing that dream will probably make her happier than you would ever think!