I'm going to not help my co-worker and leave when she needs help
What happened in the past to cause you to feel this way?
Several months ago, I had a very bad allergic reaction to a food I ate and lost consciousness. She left me there to die.
That is awful. They should have helped you when you might have died. I don't blame you for not helping them since they didn't help you.
I saw her trip and fall so I'm hoping she breaks a leg and can't walk.
That sounds rather harsh to wish on someone. Do you think you can go check on her and make sure she is able to move. I would have thought you might be more sympathetic because you know what it is like to feel alone and helpless.