If she wants protection, a dog isn't the answer. An alarm system or a gun is. A working dog is going to be a lot to handle, and there's no guarantee he'll protect anyone. Protection dogs take training, a dog that will bark at strangers is another story, most dogs will bark at strangers.
Honestly, they'd do about as good going to a GSD rescue so they could pick a dog fitted to their activity level that won't be too much dog. At least there they can be tested with children, cats, etc. Some rescues won't adopt a GSD out to a family that has small children living at home though, just some food for thought. That's not to say that the dogs they have are kooky, but it's more of a liability issue I believe.
You might find some difficulty finding a good breeder that breeds specifically for longhairs...for showing AKC/SV(German) it's a fault like white dogs are. I'd do a search online and look for dogs that are health tested and preferably titled...but health testing, IMO being the more important factor there when considering a pet. I'd avoid anything that says "oversized" because then they aren't breeding to standard - with dogs running up to 100+ lbs - which you can find in reputable breeders but they don't flaunt it as "old style" or "oversized".
One I looked at gives a 2 year on hips and 5 year on health guarantee...which is less than preferable. Being that dogs can't be x-rayed until 2 (other than preliminaries) for hip dysplasia that seems shady. If health guarantees don't matter to you, then a rescue is a better bet...and it's more likely that you'll find a longcoated dog for a better price.
Sorry I can't point you in a direction but I don't know anyone that breeds specifically for a coated GSD.
Just my opinion on it though.