It has a tiny bit of momentum, but it doesn't shoot out.
She said that she has squirted on set before, but off-camera.
In fact, the women who do it are likely more focused on fulfilling the sexual fantasies of their male sex partners than actually enjoying an orgasm.
The average woman, myself included, doesn't know whether squirting is real or fake beyond your standard urban legends, like, "Ashley's friend's ex's friend's aunt's babysitter's college roommate squirts," which does not count.