Hi, We got a 10 week old kitten on Saturday. We set up a safe room and gradually she's coming out more and more. She's even letting us pet her etc so seems like a good start. Everytime we enter the room though, she's kinda hissing at us. She isn't agressive with it and after a couple of seconds, she's rolling around showing her belly and head butting our hands. What is she trying to tell us? Thanks in advance.