Ask your friends about when they wee!! I had this conversation with a group of girls after seeing that show... mmm, the one where they took hmmhmmm... ahhh, scrubbers? and turned them in to ladies. Aaahhh ladette to lady??? There was a girl on it who, instead of squatting, stood on her knees to do a wee on the road - it shot out in front of her!! I'd never seen such a thing! But after a (rather boozy) dinner with girlfriends, it seems it's not terribly uncommon. Must be the direction of the urethra, as a PP said. I'd encourage your DD to lean forward when weeing on the loo, it will direct the urethra back a bit and I don't reckon it would interfere with emptying her bladder.