My doodle enjoys discipline. What?

[Nala and Cooper]

Nala's intelligent. She's 8 weeks old and already about 90% nailed the "Sit" and "No bite" command. But she's feisty! Whenever she does something shes not supposed to (i.e playing tug of war with my hair, chewing my things) and I respond by saying "No!" firmly, she completely defies my authority. She reacts to this by growling at me, trying to bite my finger, and sometimes even barking non-stop until I back off. Not really aggressive, mostly playful, but quite dominating... Either way, seems like she LOVES it. I'm talking like, 100% of the time I try to discipline her, she disciplines me back.

I assume she's just being like every normal, healthy pup out there driving their owner crazy. I used to dogsit a poodle and he was insanely out of control as a puppy. He's around 4 now and unbelievably well-behaved. But even he knew the difference between discipline and playtime (he actually had the best guilty-dog face I've seen in my life)

But should I be enforcing rules against this rebellious behavior? This whole time I've been laying off the discipline and just doubling the positive-reinforcement training. But it's so hard to quietly stand by and not say a word about her laying a huge dookie on my carpet.

[Judy, Meg & Polly Wolly Doodle]

Please enforce the rules, when you allow it she sees that you are still engaged with what she is doing and that is reinforcing the bad behavior.  Keep a light weight lead on her when you are playing, when you say no and she doesn't stop you can get ahold on the lead (this is in case she tries to run so she can keep doing the bad behavior) and place her in her crate until she calms down.  All puppies get over excited and it is hard to calm them with a command until they have had more training and really understand the rules.  Taking her out of the moment will help her calm faster.  Leaving her in that can give her the impression that SHE is the pack leader and calls the shots. 

[Nala and Cooper]

"All puppies get over excited and it is hard to calm them" I second that.
Ill definitely try doing that, its not the first time I heard it, either. Shes having great learning progress and Im hopeful!

[Jane, Guinness and Murphy]

You are probably meeting her excitement with your own which makes it all a game to her.  I would just softly and calmly say "no" and then remove her from the situation by crating her until she calms down.

[Karen, Jasper and Jackdoodle]

I agree with Jane; something about the way you are "discipling" is making her think you are playing, and that's what she's enjoying. She thinks it's a game.