if shes only a size 12 anyways you dont want to over-do it, eat less portions of good food, combined with fruit for snacks and drink plenty of water (at least 2 litres a day) as it does help tone when working out.. and just go swimming 3 times a week as swimming is fun so she wont think it to be a gruelling exercise, and it tones the whole body and works muscles that you cannot work any other way !!
give it a month or 2 and she will be a size 8-10 easily .... seriously make sure she doesnt go for these fast track fads as they dont work and cost alot of money!! or they will work but as soon as shes happy with her weight and cuts them off she will pile 2ce as much on (even eating well) as the body will have adapted to the artificial nutrients in the tablets / shakes or whatever!!
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