Welcome! You have already got the best advice
A couple of things I would add...
I didn't read if she is on Puppy food. If not, I would put her on a puppy food.
Toys - Lucy wouldn't play with her toys when I brought her home. I figured out they were too big and bought some toys for tiny dogs and a ball small enough for her and away she went! I also spent A LOT of time on the floor eye level with her so she wouldn't feel overwhelmed with me standing over or even stooping down to her.
I have always crate trained my dogs in the past but with Lucy I decided to try confining her to the kitchen (we have a very large kitchen). I put down pee pads for her (the smelly kind) and rather than a typical bed I bought a soft sided travel crate/pup tent for her bed. I knew I was going to be traveling a lot with her and wanted her to be used to a crate-I just left it open. When we travel, it folds flat and she has her bed with her and is used to being confined for flights.
One more thing I did that some agree and some don't. I kept her at my side every single moment possible. I carried her to the bathroom, anywhere in the house I was and she slept with me from day one. We only had one accident in five months. So, she got to see everything for the first time from my arms. Some dogs are prone to separation anxiety-she was not. Now that she is older she is independent but she checks in with me all the time. I'm of the mind that you can't love them too much
Biting? From the day she came home the first word she learned was "no bite" and if I had a dime for every time I have said those words in the past five months I could buy a Latte for every YT member
Have fun with your new puppy! Love, patience and love - and then more patience was and is the key for me...
Warm wishes,