[Gai gives the small girl a lookover-- to his eye, she's more than old enough to be capable of looking after herself for a little while.

Then again, he was out and surviving on his own at the age of seven, so he's probably not the best judge of that.]

You've got neighbors she can run to if anything bad happens. Besides, she looks like she knows how to take care of herself. There aren't many enemies who would suspect a child of knowing ninjutsu.