baby self weaning and going back to work?

I am a teacher and went back to work yesterday. Ever since, my almost one year old is flat out refusing to nurse, to the point that as soon as I try to nurse her, she has a fit and won't even let me hold her! She was NEVER like this before and it is so sad for me. I wanted to make to a year, and even though that it only two and a half weeks away, it was really holding onto those last two weeks. I was actually going to keep the night feed as long as I still had milk, but now that seems out. Has this happened to anyone else? I feel like my baby is so mad at me and hates me now for going back to work.