Congrats on your new BP! Take a breath and relax. You've only had the snake for 4 days. Leave her alone for a week and then try again with the small mouse. Forget the chicken broth though, that's unnecessary and may be throwing her off. Warm the mouse up in a ziplock in warm water until completely thawed and then blast it with the hair dryer for a few minutes. But for now, don't hold her or do anything with her for at least a week! It may be that she's striking defensively because she's scared and stressed out. And in fact, that's exactly what it seems like she's doing. If she wanted to eat, she'd eat. Granted, their aim can be spotty when young, but not that bad. If she's striking at you and the air, she's scared. Leave her be.
Can you tell us about your set up to rule out any husbandry issues? Temps, humidity, hides? How are you heating the enclosure and how are you controlling that heat? Do you have thermometers? And if so, are they digital or analogue? What kind of enclosure do you have her in?