Can you actually live in the area on $12/hour? Also, someone should teach her about salary negotiation. Stupid to box yourself in like that. She'll probably end up working for $10/hour.
Actually, I'm willing to bet the opposite. She's going to get significantly more than $12 an hour. Why? Because by saying she's willing to accept $12/hr and fetch lattes to get where she wants to be... she (deliberately) puts herself in a position with no negotiating power. You can't play hardball against somebody like that without feeling like a dick about it. It's like saying to somebody who's about to punch you..…
Don't assume that other people are like you, especially when negotiating.
This is awful advice.