Razel, to me, she sounds like she's sick in the head. Being proud of hurting people and bragging about it with a grin on her face? How sick is that? Why are YOU ashamed? you did nothing wrong-if asked, just say I had to leave or I was afraid I'd hit that sick ***** in the face.
Why was she bragging about hurting someone? If I were your co-worker, I'd be more understanding and sympathetic towards you than the lady who likes to hurt people. Then again, I'm somewhat of an outcast-go figure.
Anyway, don't be ashamed. If she made you sick and mad than so be it. Go back in there with your head held high and steer clear of the idiot who gets her kicks off of hurting people.
Much luck with this. Hugssss