This is an apology written by someone with extensive legal training. What is still incongruous about this statement (as was the initial statement) is her seeming perplexed by the hurt caused by her blackface at a Halloween party.  

This professor is well-educated and has lived and worked for decades at the UO, a liberal university with visible activism by students and faculty. And she is trying to convince us now that she was making a statement about race and provoke a conversation about racism by wearing blackface at a Halloween party, but also says that her action "provoked a discussion of racism, but not as I intended". That's simply not believable. 

Think of this in another way. If men wanted to have a serious discussion about sexism, would it be ok to show graphic pornographic images of women to women and say, "This is an example of sexism by men"? The answer is an obvious "no" because it's offensive, and because there are other ways to have a real discussion about that issue.