Sounds like you have got your hands full.
First congrats on your baby.
Secondly, as you said, she thinks she is alpha, you need to teach her that you are alpha. When she bites at you, I would sternly say, No and make sure that she stops the action and put her on a time out of a few seconds. Let her know that the behavior is unacceptable and that you will not let her do it.
You can also try treating and praising when she does not act agressively towards you when you do what ever it is you are trying to do--for example, putting her topknot in.
Thirdly -make it fun when you put her harness on. Treat her when you put it on so she's seeing it as a good thing. Once she gets used to it, try putting it on her with lots of treats and praise. Take it off after a few seconds or minutes with treats and praise. Do this several times and I bet before you know it, it is a non issue.
As for the treats, I would give her something that she is crazy over and use them only for training.
Good luck.