I mean I say just rule out all possible husbandry issues, do you handle her on a regular basis or has she not been handled recently, or is it possible that she is being overhandled that could be stressing her out? My new hatchlings have been hissing and striking but I think its because they are getting used to a new home and also havn't fed yet, but for the first day I got them, they seemed very sweet so we will see what happens after their feed.