Hi. I read this yesterday but didn't know what to say. It sounds like a difficult position to be in, especially given the history with you and your co-worker.

It seems like if they are offering you two positions, there should be one available for your co-worker, but I don't know. If they are offering you your choice of the two positions and not offering anything to her, then it sounds like they have made their choices, and probably if you refused both positions it would not change anything for her anyway. You need to choose what is best for you. She will understand that. It is the choice that you have. You are allowed to exist, even if sometimes that inconveniences somebody.