First tell her clearly that you don't ever want to talk about money, a subject both boring and depressing. Ask her instead to tell things about herself. I've found that asking questions in return, even though I usually couldn't care less, often is the best way to stop overly inquisitive people.
If she in spite of this continues to ask something money related, you should tell her that you said you didn't want to talk about money, change your seat and never speak to her again.
This is what I would do, but then I'm really not a people person...