Hi Maddy and Maddy's Mom!
Shari gave you excellent advice. 6 weeks is considered too young to be separated from the Mum and litter mates as that is the time when pups learn bite inhibition. However, as Shari pointed out, you can teach her. Since 8 weeks is considered the absolute minimum age that a pup should leave it's Mum, and personally I now think 10 is optimal, you will have a few weeks of adjustments. By four months of age, you will start to see patterns developing, and by six months, when the teething is over, new patterns will emerge. Puppies are puppies until at least a year (especially with trustworthy housetraining).
Puppies will be nippy and bitey until they loose their puppy teeth. It is important that you provide her with SAFE appropriate chew toys, and other things to occupy her. Puppy kongs are a great idea, as well as a face cloth, slightly dampened, rolled and frozen. The coolness will soothe her gums and also provides a reusuable "toy".
As with any toy, she should be monitored at all times. Please stay away from rawhides as they pose a choking hazard.
It sounds like you are doing well with housetraining so far. As with any training, consistency is key.
I would also suggest that a Vet check is absolutely in order. Beneful is not a very highly rated food. When you decide on a better quality product, remember to introduce it to her slowly. A sudden change in diet, particularly in one so young, will result in more diarrhea. The pup should be fed at least twice daily for the first four months. I would recommend three feedings, and include a quality biscuit as part of her diet. The biscuits can also be used for treats with training.
Congratulations on the impending arrival of a human baby as well. Hopefully that baby isn't due for a while and you'll have plenty of time to get to know Maddy first. Being part Lab means that your puppy will be smart and busy (usually)!
Welcome to the Daily Puppy from Oliver & Henry, and their Mum (Deborah) in London, Ontario