Hi Sweetie,
Honey I think you are most probably exhausted and finding it difficult to see any positives right now. Just a few short weeks ago a 1 nap routine was seemingly out of reach and for a long time you had no definite plan and MR had no consistent routine, and now she has. You are a Mother of 2 very little one's and as the Mammy of only 1 I can only imagine how hard that is. But honestly Hun, from an outsider looking in having followed MR's progress, I would say she is firmly on 1 nap right now. I know you want the WU later, of course you do, those early mornings are so harsh, but hand on heart I'm not sure I would try shifting anything right now. I wouldn't leave it as is forever, but if she is, as you say clocking up her maximum sleep as a rule, then maybe changing things up right now could backfire.
WRT the early start today, it happens to us all, yes she is probably OT but one bad day does not a disaster make
Just stick with 5.45 in the morning and EBT. Every day MR is resetting that clock just a tad more and I believe things will get better from here not worse. Just take a step back, take a deep breathe and give yourself some credit for how far she has come thanks to you coming out the other side of a very difficult and challenging time
A (BIG HUG) from me. I hope you can see there is light shining brightly at the end of the tunnel
x.