One of my old rabbits did that when he wanted me to move out of his way, or wanted me to put him down. If I was sitting on the floor and he wanted me to move, he would nip me. Or if I had him on my lap and he wanted to get down, he'd nip and dig at my leg to let me know he had enough. Can she get off your lap if she wants too? Maybe it's her way of letting you know she wants to get down?
If not, and it seems playful then I'd agree with what the others said already - every time she does it I'd put her down on the ground and ignore her for awhile.
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