Lab Puppy Biting

Question
I have a 12-week old female black lab. I'm having a lot of trouble stopping her from biting. I understand she's a puppy and it's natural. But when I scold her or try to discipline her about her biting she becomes very mean and aggressive, which to me is not normal. The only way I can calm her down is to actually leave the room.
I've tried crating, offering her a toy in place of a hand or foot, offering food, the bitter apple tasting spray when she does this, but nothing seems to stick. She heeds it the first day or two but then she gets used to it and it doesn't work.
I'm especially worried about this aggressive behavior and would appreciate any suggestions.

Answer
I think you are doing the right thing in consistently correcting her for biting.  However, you can't tolerate her reacting aggressively to your corrections.  It calls for stronger corrections than the otherwise effective "Ut, ut, ut!".  When it misbehaves, throw it on its back, and
growl "Bad dog!" right in its face.  Hold it down until it lifts one back leg
to show submission.   You can pick her up with your hands behind her front
shoulders and hold her up with her back to you.  Keeping her far enough away
to keep her head from smashing into your face, hold her until she stops
struggling and relaxes.   Others like the squirt bottle or squirt gun.  Fill it with water and a little vinegar or lemon juice.  Give it a squirt in the face as soon as it misbehaves.  Dogs hate that.

Start obedience training.  A good obedience class or book is about you being top dog, not about rewarding standard commands with a treat.  Start obedience training the day you get the dog.  Build on the foundation of housebreaking.  The younger the puppy, the shorter you must keep sessions, only a few repetitions at a time.  A few minutes here and there, and by the time the puppy is 4 months old, people will be impressed with what a nice dog it is.