I've managed to become much calmer - I was always a bit organized but now I am very organized and aim for calmness in the house and also how I deal with DD.
I've also learned that I can stand up for things when I need to (usually on her behalf rather than mine).
And I have learned, some years down the road, that actually, I can accomplish quite a lot when I set my mind to it, so I can still do things myself if I just have a plan for it to work out. And that I can still have the flexibility I need, as long as I make a contingency plan ahead of time (think about each event, work out pressure points, and how to deal with those) and also how to adapt to things changing "on the fly" by knowing what is happening and routes and options ahead of time.
Which has proven useful for things not related to DD at times (such as when the snow cancelled my connecting flight through Heathrow a couple of months back - I knew who to get in touch with and how to make sure I got home, as well as alerting people quickly to the problem in case they needed to change things - and managed to get home only a couple of hours later as I was quick enough to get one of a few spare seats on a flight just a little later rather than having to stay overnight and connect the following day). And it also means I've learned that the direct route is not always the best (for anything not just for travel) - so to make things work for me, I now am happy to look at options that may involve going sideways or 2 flights or a plane and a train - but arriving at a reasonable hour rather than arriving late at night and not getting dinner and having a really bad sleep somewhere.
And yes, yes, yes about who is supportive and who is just a "fair weather friend" (or family member).