Jack handles OT really well and he did do 2 short nights and very long days at first, but then he sorted himself out. Do you think your LO can handle a couple of longer days? Will she cat nap later in the day, even? I ask cos jack won't - I'd have to do an early, capped nap in the car and then probably another shortish one in the afternoon cos he wouldn't take a good nap after a morning cn. But jack is very lsn so your LO will probably be more flexible!
It sounds like your LO is doing decent nights, it's just that you're stuck in an EBT / early rise loop. I guess the other way to shift BT and hopefully WU is treat it like daylight saving and move BT by 15 minutes at a time, every 3 days. That might be a gentler way to do it?