personally, I'd say no. They can be different, but I've never seen it. This is more teenage puppy dirty acting behavior.
You are the one that's most important to her? Like you said, you supply her training, her fun, her rules, everything. I'm not sure of the dynamics with the other humans, but you are her most important contact. This behavior suggests that you are very much the leader in your relationship and she's saying (in the most serious way she knows how) "don't you tell me what to do".
I know you are doing all you know how to do, you're trying and giving it your all to make this puppy understand. I don't for a minute think you are slacking. It's hard. Did you say you were going to order that book (The Good Dog Way)? It's everything to do with living with dogs like yours. It's so helpful to know that you aren't alone & what it takes to make things change. The book is not a how-to, but it will give you so much insight. All this stuff I don't have words for he wrote brilliantly and in an extremely easy to read format.
I know I always feel like the meany drill sergeant here, I don't want you to give up. You've come a long ways already and now you're coming up on the most rebellious time. She'll be getting bigger and stronger so you'll need to be mentally bigger and stronger to deal with her antics.
Update me - She's still wearing a collar and short leash in the house? What kind of collar in the house? What kind of collar when you take her to town? What was she doing in town that you had to grab her collar and she was making noises and still trying to bite? Furniture privileges at all? Sleeps in her crate at night? Sorry, I think I was just shocked about this, you've been posting some great progresses in so many things, I didn't realize she was still being such a stinker.