My DS took a paci from day 1 however it took a few weeks before my DD took one, and I had to experiment with several different types of soothers before we found one she liked. I'm not that experienced in breast feeding but she could just be trying to establish your supply as well because it is still the early days. Some LOs never take a paci and find something else to help soothe them, like their hands or later on a lovey. I'm sure some BFing mamas will pop on here with some great advice, but I would just keep trying but be aware that right now it is normal for her to want to nurse all day long.