got a question about my new ball python

[gogoyubari]

i just got a baby bp from lllreptile and shes a little grumpy not like trying to bite me but just hissing a little. when i firts got her she was verry active and did not mind me holding her. shes still young so i know shes a little more active and all. but why do you think shes hissing at me now? i think its because she is in a new place and a little stressed. but someone told me it might be because she might be hungry. what do you guys/girls think?