Unless I'm mistaken, the award was based on an adversely affected promotion, with the situation concerning her transfer back to the UK coming into play only as it set up the conditions that resulted in the adversely affected promotion.
My reading was that if her promotion hadn't been adversely affected, there would have been no award... and it is likely she wouldn't have even filed the grievance!
I strongly suspect there is more to how the evaluation vs leave situation developed than any of us knows... the transcripts of the court proceedings would be needed to determine exactly what happened there.