... we have one.
Its is cool
You can do anything on it.... so KEEP in mind, that kids and adults play fun games on it. Many are 'free'... they are called "apps."
BUT... some of games you have to pay for.
Once my son was playing a game on it... and then my Husband got a BILL for $80+ dollars. Turns out... my son had been playing a game in which he had to 'collect' things on it. Well, each time he got one, he got charged for it.
My son is only 4... and he knows how, quite well... to turn on my Hubby's iTouch, how to put in the password, how to click on things and navigate through it ALL. AND he knows how to download things... although.. he is not allowed to do that.
Yes, the iTouch... like a computer.. .is "online" and you can surf and download things... thus, with a Teen... I do not know how, you would put "parental controls" on a thing like an iTouch.
I am not the techie in the family.
IF you go to an Apple store... they are VERY good, at explaining how it works, what you can do on it and answer ANY of your questions. They are very good... at helping people. That has been my experience.
Go to an Apple store... and just talk to them. Ask them anything...
But yes, it is a great gadget.
Don't know if for your daughter or not... but it is fun/useful/and great.
all the best,
Susan