@drspouse I hope work is being understanding and not pressuring you for a return date. There’s no right way. You do what you need to do. I know I have said that a lot, but it’s true. Some go back sooner either because of circumstances beyond their control or because keeping busy helps (not in a 'getting over it' or 'moving on' way, definitely not, but in a getting through the days way); some have a lot longer off; some have a relatively short period of time off, then go back, then have more time off.
You’re right about children’s parties. That mum has a long road ahead if she doesn’t grow a thicker skin.
When DD1 was 3 she went through a, thankfully short-lived, phase of having an imaginary mummy. Whenever I told her to do something she didn’t want to do or said no to something she would say things like “Other Mummy says…” or “Other Mummy isn’t mean.” It stopped when, after a long day of Other Mummy being so much better, I said “ask your other mummy” when DD1 asked for another story at bedtime. We laughed about the Other Mummy phase when she was older, and as a teen, when I said something she didn’t like, she would occasionally jokingly say, “Other Mummy…”
Good luck to DD2 @Woolyhatson.