How are you doing? I hope you are getting out and doing some fun things and spending lots of time with DD.
I'm curious... if you do separate and have to go through D, what are the custody laws like in Australia? Is a 50/50 time split typical or would you do the every other weekend? Any way you'd get primary custody?
For your daughter's sake I support your decision to try and keep living arrangements as they are regardless of how nutty your W becomes during her MLC. Just make sure you do things for yourself too.
There is no arriving, ever. It is all a continual becoming.