My 12 month old female German Shepherd does not like to be pet. Is this petting issue abnormal?

Cindy,

My 12 month old female, German Shepherd, Bella, does not seem to like to be pet. In fact, she does not seem to like to be touched at all--this includes grooming. As a puppy, whenever I tried to pet her she would turn and nip at my hands. I would always tell her no and thought that she would grow out of it. She hasn't. I have found that after a good walk she will allow me to brush her without it turning into a wrestling match although I still have to use a lot of treats.

I found out that I was pregnant a month after I got Bella and so she did not get the attention I would have liked in the beginning. I have recently watched the following videos and have tried to implement as much as I can. However, as a mother of two small children (a two year old and a 2 month old) I feel limited in what I can do with my dog especially in the winter when I can't put the kids in the stroller and go for a walk. Bella spends much of her time in the back yard.

Your Puppy 8 Weeks to 8 Months
Basic Dog Obedience
Establishing Pack Structure with the Family Pet
Dealing with Dominant and Aggressive Dogs

Is this petting issue abnormal? I thought the grooming segment in one of the videos with you and your dog (where you are teaching the dog to allow you to touch his paws and muzzle) was helpful, but I'm finding Bella is getting somewhat mouthy at trying to get treats from my hand or will jump on me. Any advice would be appreciated.

Thanks,
Courtney