You did right...your ex friend is a narcissist. She calls you a bitch when you stand up for yourself because people like her think their shit doesn't stink. She wants the power and control, she always wants to be right and the center of attention. It's not that your are doing anything wrong, it's that you are not doing exactly what she wants, when, how, and where she wants....in other words you are not catering to her and that to her is "wrong". People like her get mad and act like everything is always someone else's fault and doing, and they make every effort to try to make someone feel badly by belittling them and judging them. You're not the problem. SHE is and it is much better that she is your ex friend (you're better off to keep it that way).

You need to get rid of her

Because she’s a bitch.