Ok. I didn't mean you should do exactly as the article said, just that you might be able to get an idea or two from it... 😉
What if you try to (with help from the article above), from your old (admin) account, Consolidate the music out to a "neutral" place (e.g. /Documents/), copy the iTunes Library file to her ~/Music/iTunes/ folder, and then, from your daughters account Consolidate it into somewhere in her Home folder, e.g. ~/Music/iTunes/ where there should be an iTunes Music folder by default?
And with iPhoto I have no better idea then to export all the images e.g. to /Documents/ and then import them from there when in your daughters account.
Edit: I see you took the point before I managed to explain it... 😉