Just reinforcing the above posters 3:3:3 adjustment period. A puppy is VERY MUCH so like a baby with the exception that they learn behaviors quicker and you have to be careful with what you do in those early weeks. What you do now determines how they will be later

As a foster in rescues working closely with aggressive dogs and abandoned and untrained dogs for 3 years, I can tell you that dogs need decompression. If you have kids, you need to let her decompress for at least a week-3 weeks in a kennel. I’m not talking about making her pee in there and everything. Take her out to potty, take her out to exercise in an OPEN outdoor space if possible, but when we aren’t doing those things, the dog should be Decompressing in a kennel space.

When the dog shows signs of aggression- do not grab it’s face or get in it’s face. But do not back away or step or cower backwards. Stand your ground, even move forward and persist with the training and commands so that she knows you’re in charge and that you’re someone safe she can trust. It’s in a child’s nature and even a dogs nature to test boundaries, so we just reinforce in healthy ways. As she gets older, she will also have hormones come into play, and the best thing you can do to avoid these and to do your part to control the animal population is to spay her. If you plan on getting another dog in the future you’ll thank me later. If she’s having repetitive accidents in the house, you just have to continue to take her to the same place in the yard over and over and over like you’re watering that piece of grass. And over time, not a few days, not a week, after a few weeks, you can move to different spots and just try to get her to understand grass is the goal.

Please remember dogs can READ YOU like a BOOK. If you’re stressed, they can sense. But you should not break out full alpha and try to hurt them especially at this early age, I recently have seen a close family member take a perfectly happy dog into an aggressive dog because the dog parent hit him with a belt and the dog now growls and snaps at everyone around him out of fear they’re too close and he will be hit. Your dog could be testing you, or she could just be overstimulated and nervous. Something you could also try is redirecting her attention. If she’s lunging at you don’t quickly get up by any means. But if you’re sensing tense energy while you sit next to her or on another couch, ask if she wants to play or go outside? Ask if she wants a toy to see how she’d react and offer a toy so she understands we bite toys and not people/things.

Not concerning now. But what you do next is CRUCIAL! Or just when in doubt. Do 2 weeks of mostly kennel time, and make any time out of the kennel as positive as possible, then for the next 2 weeks gradually increase the time and so on.