Used to be friends now enemy’s

Me and my best friend well used to got in a fight and things just didn’t end well. We work together sometimes and som things are eggshells there. But we have been doing things together hip to hip all the time. Well since this fight and things went south. She is now going back and trying to tell me I owe her money and telling me I have to pay her back. How would you respond to this? She doesn’t get that there has been times I have payed for her stuff and that things are even! Maybe a few dollars not but still.