Pulling it away will make her lunge for it. And that is not what you want. I get so peeved at my DH. He can take a gentle treat taker and make them into a lunger, because he's so fearful of them snapping (even if they don't), he pulls it back, causing them to lunge for it.
Sipsi,the best way is to hold the treat entirely inside your hand, closed up into a fist, with a tiny bit of the treat sticking out between your two middle fingers. It's harder for her to bite you that way, as it would be if you were holding it between two fingers. Put it right up to her mouth, so she knows it's there, but with the top of your fist in front of her. It's harder for her to munch on your fingers that way. Tell her your word (I use "Take it nice" but gentle works fine). She should either nibble it out, or you can open your hand flat so she can take it from the palm of your hand, if that's easier for you. Of course, don't release it until she's taking it gently.
Work on that, without using it for a training reward. By that I mean, work on this individually. It won't take her too long to realize that if she calms down the treat will be forthcoming. Then you can graduate to using the treats for training.
Good luck, I hope this was somewhat clear.