My pups leave home at 8 weeks (small breed) and although they do sleep a lot at that age, when they are awake they are very playful for about half an hour at a time, then just crawl off and drop off to sleep, They will wake up and need to wee or poo, and when they have eaten they will also need to go, and usually after playing for a while they suddenly need to pee. They always have (or are sent off with) toys and treats such as pigs ears, and they will spend ages chewing or playing either out with the family or in their puppy pen. I would definitely get her checked.
Just one thing, while she is this young, don't let her play too long or have to much exercise - she should not be going for a walk until she is about three months old and then only for about ten minutes at a time, maybe a couple of times a day. Have you asked the breeder how the other puppies are doing?