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...