Which is why I always advise the pup be trained to be the dog you want, don't wait for problems to arise before teaching rules and boundaries and self restraint.
Yeah it takes time but a lot less time as a young pup than an adolescent, I'm sure you'll get there, good luck.

If your existing dog behaves in the way that you have described, I'm not sure you need your first dog, far less a second.

It sure is easy from the comfort of a spectator chair to lecture someone else saying "maybe you're not the type to own a dog".
If I had a dollar for every time it happened in a dog forum... I could retire and hire the Dog Whisperer to do the raising haha.

All I can say is this Boxer/German Shepherd is high energy, highly demanding/exhausting and in to everything and destructive the moment unsupervised. If this is the way all puppies are (I can't remember it being so bad) I think I'm a 2yr+ adopter from here on out. Never again! lol.

I have always had at least 2 dogs at a time, yes they are company for each other and play together. But the main reason for getting more than one was because I wanted them!

In some ways two dogs are easier than one - when they are adult! The main problem is finding the right dog. I trust my dogs not to fight when they are on their own, well as much as you can trust any living thing. My friend has to leave her dogs on either side of a baby gate, feeds them separately and often walks one at a time.

Two dogs also equals double the food bill, two lots of vet bills, etc. Without my dogs I would be richer

I have a big, high energy dog - an 80lb adult collie. It gets two hours or more exercise a day, every day. Rail, hail, or shineWe walk at least six miles and he does much more since he runs about off the lead/leash. But, I think that's what a high energy dog needs. If you don't have the time or inclination.........

And I certainly wouldn't put up with nipping or scratching.

Just my two cents worth.

You must have some training classes nearby. Why not do a little bonding with your dog, and take advantage of having some professional guidance? When she is fully house-clean, and has learned some restraint and doggy manners, you could then think about about getting a companion for her.
You say, if you had a dollar for every time it happened in a forum ....
People are just trying to give advice, they can't all be wrong.

Very constructive post if I may say so.
I hope Jeff heeds your advice.