A few questions about the german shep pups - Page 2

Question: "I am having her go through obedience classes"   are you taking her to class and doing the learning and training with her? Or sending her to someone for them to train? I wasn't sure on that point.

However ALL the classes you and the dog can attend will be the best and easiest way to solve this problem. She is young enough that you can ask more experienced people in the classes if your dog can be introduced to their dog if theirs is friendly. Also another way is to just practice heeling along side someone else experienced and usually in a short time the dog doesn't even pay attention to the other dogs. But doing this a LOT is VERY beneficial. IMO  The panting would have to see to truly understand if something to worry about, or just a normal panting. If you feel really concerned a vet check is always the way to go. IMO

I'd redirect her focus to you, then treat.  Get her out and about to see other dogs often, never close always from a far, so she has no bad experiences.  Ideally, you want her to ignore them, and IMO the best way to do that is to get her to focus on you instead, (which is always a postive thing, which is why you give her a treat. )  Be consistent.  As she matures, if she still has a problem with other dogs, you will need to do firmer corrections to let her know it is not acceptable and that you are in charge of the situation. 
Much has to do with the temperament of the dog, some are much easier then others. :)

As for the panting, puppies do pant a lot but I'd get her checked out if you are worried about it.  Make sure she has fresh water at all times.

I think GSD's pant a lot, as they stay cool through their tongues...

NO PINCH COLLARS ON A PUPPY!

AND ESPECIALLY NOT BEFORE YOU FIGURE OUT IF THERE IS A MEDICAL ISSUE.

Just how hot is your house with the A/C going?  Some people think 78 degrees F is okay -- but that is hot for a gsd pup.  If she needs to live in a hot place, you need to (1) brush her daily to keep the undercoat as light as possible; (2) keep cool water available all the time; (3) position a fan blowing in a place that she can get to readily when she is in distress.

But, of course, you need to get to the vet to do some testing.