I suggest you periodically take the rawhide from her and speak in hushed tones telling her what a nice treat she has and how much you like it,,, You dont even hve to take it far from her face,,, just far enuff for her to not reach it..keep petting her and praise when she doesnt growl,,, but if she does,, dont pull your hands away,,, tell her no no,, youll give it back but always be slow in your movements and gentle tones....... I did this both my dogs when they were little and it worked.... I can take a roast outta my dobies mouth with my tongue if I wanted to,,, not that I would use my tongue,, ICK,,,, but you know what I mean..... sounds like maybe she is just feeling stressed from her exp in the kennel... or perhaps a treat was taken from her by anotherdog,, who knows....