Tina, I don't think you are really understanding.
You got her 2 weeks too early. If she was with her litter, she wouldn't be having any training at all apart from natural life skills.
The fact that you have already started has given her a head start. As Kala, TahsSunny and I am trying to say, is that you can't expect her to be perfect. Or anywhere near perfect.
I got Roly when he was 8 weeks, and he is well trained. I got Lady when she was 1 and she is the most intelligent dog I've ever met, no joke!
Zoey is a Border Collie, she will pick things up very quickly once she largens(word?) her mental capacity. Teaching her not to bite and toilet training her should be your main focus. Sit, drop, stay etc. should be 2 minute exercises you do every so often, and not freak out and get frustrated when she can't do it perfectly.