Best way to ignore someone who is trying to provoke you?

I have this ex best friend who I no longer speak to. Even though I haven't really done anything she cut me off but thing is that ever since then she's been passive aggressive. You might think someone who cut you off would not bother anymore but she just won't stop it seems. She's provoking me right now, I'm trying to ignore it but I'm starting to get pissed as I feel like she has the nerve to do so.
Best way to ignore someone who is trying to provoke you?
Post Opinion