well, a couple question we need to ask first.
1) what iOS version are you running on your iPhone
2)What model and firmware is your daughter using?
3)what print function are you trying to use? Airprint?
CLick Settings-> General -> About to find out what version of the OS you are running. The model will be stamped on the back of the phone unless it's the first or latest iPhone.
I can tell you that if your phone is a 3G or older, I don't believe it can take advantage of AirPrint. There are a number of key features that are left out of the 3G's OS.