I would set her nap time actually, if you let her nap early on EW days it may well reinforce the early starts. I'd be tempted to set it at 12, no more than 15 mins early for an EW, and possibly start to shift it out later to 12.30pm. I would also bring her BT temporarily earlier while she is EWing - to more like 6.30pm for now and then move it back out when WU improves. Sounds like a bit of an OT loop right now - what do you think?
Also just wanted to say - annoying though it is, one WU a night isn't actually bad. It's pretty common for my 3yo to wake at night. Sometimes for the toilet, sometimes a bad dream, sometimes lost her lovey. In a way if its a quick walk in, tuck in and walk out again then honestly that's not so awful. If molars are coming too she may just need that extra bit of help x