Just whenever you go to buy something remind her that a job could get you money... and maybe she will think about it and let you get one. But talk about applying for places near your home, and start with easy jobs.
Kinda because she may have to take you there. I don't know why she wouldn't want you to work. It can teach you responsibility and get paid. I'd be all for it! My daughter is 15 and looking. She's almost done with corn detasseling. Keep talking to her.