plagiarism

Hi guys, I was informed that my story had been plagiarized. The so-called 'author' cut and paste my story then use find and replace to change characters' name (I know she use find and replace because she left one of the names as Brock. What a moron.) Oh by the way, poor Henry, she made him a dog.

Even though it really made me lose my desire to finish the story, I still feel bad leaving the story unfinished. So, how should I cope with this? Any idea?