These are your words:
I really need to maintain the No Contact. I told her not to contact me ever again, but I'm sure she will at some point. Maybe i should change my phone number.
You brought up the option of changing your phone number. How would you miss a call from your parents if you gave them your new number? You were complaining that she keeps calling after you have told her not to. It's totally your decision, but we're just going by what you said. If you don't mind just blowing her off when she calls, then what's the problem?