I think the biggest danger here is your daughters total inexperience with dogs. As others have pointed out ears up is not particularly a sign of aggression as much as alertness.
She really needs to learn about body language cues (both hers and the dog).
Syz recommended classes and I heartily agree. In addition to that there are several really excellent authors of books about training dogs and understanding them.
One is Brian Kilcommons. Another is the Monks of New Skete who breed and train German Shepherds as a profession. Their dogs are highly sought after and there’s a long waiting list for one.
They also are available for training both on their premises or yours. They had a brief series of programs showing their methods on Animal Planet and it was really interesting. Unfortunately it only ran for one season but might be available on Netflix.
I’ll find a few links and edit them in. Both Brian and the Monks really know their stuff.
If you don’t want to have to worry about rolling the dice, get your daughter a few of these books or DVDs. The dog is still a puppy but if he grows into adulthood with no training you could all have a serious problem on your hands.
Years ago I had a GS and I shudder to think what would have happened after he was full size had I not trained him.
They are wonderful dogs and very loyal and protective but they MUST know who is boss. Otherwise you could have a neurotic and potentially dangerous large dog.
.
http://www.dogsbestfriend.com/
.
.
http://www.newskete.org/newsketedogs.html
.
.
http://www.amazon.com/Brian-Kilcommons/e/B000AP777O
.
http://en.m.wikipedia.org/wiki/Brian_Kilcommons
.
http://www.amazon.com/s?ie=UTF8&field-author=Monks%20of%20New%20Skete&page=1&rh=n%3A283155%2Cp_27%3AMonks%20of%20New%20Skete
.
...