Are you able to be friends with her, on any level? Seems cutting off contact with her is drastic. Did she do anything to actually hurt you? If not, can you just reduce her to "friendly acquaintance" status?

If you think she is being passive/aggressive and ignoring you, by all means end the friendship.

Although honestly, I may not be being fair to you. If it's all or nothing for you, then err on the side that's best for YOU. I have friends who triggered, they are passive aggressive and cruel, predators really, and stupidly I tried to salvage the friendships for 3 futile years because I thought --and they said--something was wrong with me.

Friends--real friends--are there when you need them, and not just in bits n pieces.