I'd prob do it now whilst her WU time looks to be a bit flexible. When I did the move with DS his WU was so fixed regardless of what time he went to bed, it was like I had to make him OT (and fast) to get that WU time to move because his body clock was so set on the WU time. So for me if WU was shifting I'd use it as an opportunity to get it somewhere close to what you want.
The thing is you're not going to be able to keep going on a 12hr day and 11.5hr night it just doesn't add up does it.