I'd say "Master of the universe" is goin' too far. XD
Super Being for sure.
She has the power to change the universe around her at will. (Bringing the one she was just in to an abrupt (and likely painful) end.) However she lacks the knowledge that she can do this.
As far as she is aware, she is just like any other girl (thus the way she acts to make herself different.)
Being "master" of the universe would imply total control.
Unless she is aware of her own power, (which she might be to a degree, if nothing else she seems to know it's there on a subconscious level) she is by no rights the Master of the Universe. XD
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<Biological... Impossible? Heh if you keep calling what's right infront of you 'impossible' you are truly foolish!>
I clenched my fists and pulled them in as I yelled the simple truth:
<I exist! Therefor; I am!>