My biology might be a little rusty, but last time I looked, the vaginal opening was not - and could not be - that high up the vulva (follow the trajectory arc).
Know what is .. yea, you guessed it. The urethral opening ....
It's piss (and yes, I know it's clear. Guess what else? Drink two liters of water and your piss will be crystal clear too).
The major tell is the width of the stream. Piss comes out in very narrow streams due to the size of the urethral opening; true vaginal orgasmic discharge comes out more like wide 'sheets' of fluid, for the same reasons. It's about trajectory and ratios, people. Math always has the answer.
That being said, she's cute.