She's teething. You need to provide him with the appropriate toy for that. I would suggest a gumabone or nylabone and when she starts to bite give her the toy instead. Praise her for chewing on the appropriate thing.
Kelpies have a pretty high work drive. Are you ready for that?
The Kelpie is NOT a good breed for a novice owner, but what's done is done. Get her plenty of toys, as soon as she nips tell her "NO" and get up and move away from her. Then ask her to sit or call her too you and give her a toy.
Anyone who can take over a whole plane with tweezers... might just deserve that plane.
I agree with wandering this may be associated with teething. But what wandering said is more on the mark. Kelpies love to bite. I have my suspicions that kelpies were bred into Malinois to give mals the passion to use thier mouths. kelpies are great dogs. But I agree, your going to have to learn about dog training, in a short amount of time. Because nipping is just the beggining with this breed. It would not suprise me if this dog runs across furniture. or jumps onth kitchen table to get a better look. barks non stop. And chases everything. good working dog. Bad pet dog.
I believe a dog's finest hour, the greatest fulfillment he holds dear, is when he has worked his heart out in a good cause and lies exhausted on the field of battle-with a ball in his mouth."