It's totally normal. Girls have to learn to 'point' just like guys.
I DARE you (double dog dare ;) to "try it" next time you have to pee (and already need to wash the floor/ are just about to get it the shower.
"Rock" your hips in different directions (like w sex)
Lift up one cheek
Lift up the other
Slouch, like sitting on a chair.
It will be like a 'pee sprinkler' shooting per in all different directions!!!
Oy.
You'll also see how hard it is to make yourself 'aim wrong', after years of pointing yourself to pee in the water and NOT on the wall!!!
It's just that, as women, we've been aiming correctly for decades, so we automatically "sit right".
BIG HINT
Have her wrap her arms around her knees and "look" through the crack in the seat to watch the water. Her head will be between her knees, and shell be looking upside down. That will point her in the right direction.
So will "tooching" out her bum (how models sit when being photographed, digs your clit into the ground, not comfy, but "pretty") by arching her low back. Won't dig her clit into anything since its empty air below, and works as well as bending over, but that's a harder thing then the 'bend, grab, and look'.