Ball Python Yelping

I have a 2 month old baby Ball Python.....Tonight I kept on hearing this
squeal and pin pointed it down to my python making the noise... She was
just clammering around her tank and every once in a while she'd let out a
squeal... I even saw her mouth open when she did this....at first I thought
it was her shiny soft body rubbing up against the glass of the cage and the
friction causing the high pitched squeal, but nope it came from her.....WHAT
THE HECK IS THIS....I've never heard of such a thing in all my research and
reading up on them...... I took her out of the tank and held her and let her
have her way with crawling around my apartment (under supervision of
course)...and she didn't do it again until I put her back in her tank...
STRANGE...