Hiya,
Yes your puppy sounds perfectly normal - I had a friend who aptly called her puppy velocoraptor jaws at this age

. As for them looking evil they can do but your instincts are right and she is I am quite certain just playing and doing what the majority of pups do at this age particularly when they are having their mad minutes or doing the puppy wall of death around the living room.
Lots of people worry about this kind of thing or are taken by surprise by it even if they are expecting it and you're better off asking here and looking for advice if you are unsure, we were all beginners at one point!

The article you have been given is a great starting point and really worth following. Puppies use their mouths and teeth naturally and it is a great time to be using this and teaching them bite inhibition.
I would also recommend if you aren't already enroling in a training class when the pup has finished jabs. Look for a class that has maybe 5/6 per class so ins't over crowded and will mean that the dogs and owners will have space and individual time if needed. Make sure that it is a class that uses reward based methods and that will be fun for you and your new pup. A well run class can be invaluable for new owners and great for pups to get used to learning and experiencing new things. Enjoy your puppy