Buy or borrow some cooking books which has both Chinese & English. Select the dishes you like her to cook and ask her to follow the instructions on book.
You can try to record the cooking programme on a video recorder or DVD recorder on TVB or ATV within the women's programme . When you are free, you can play the programme and translate the steps and make modifications to meet your requirements. It's free and you can play it for a few times until the helper learns the steps. Ask her to take notes when watching it. Let her practise the dish the next day and you give comments . Repeat this dish the next week, comment again and usually she can manage to cook it and improve. My maid is learning in this way for 1 month and has got great improvement .
Hope you can make it !!