Do you hand feed her? If not try putting one of her fav foods and place it on your hand by her. It usually takes some time but after a while she will take it.
If you do then, you can take a little piece of a leaf in her cage if she has a live plant or a little bit of apple and set it on your fingers. Then move your fingers around to move it, so she thinks it is moving. After a while they will readily take the vegitation you provide.
I have a hibiscus in my famale veiled's cage and she loves to eat the flowers and the leaves. The flowers usually look really deformed because as soon as they start to pop up they get eaten by her.
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Meg 