Ko.Fe.
Lenses 35/21 Gears 46/20
I'm more than a little confused about what your criteria are and whether you really are looking for something significantly different (and quite possibly your decision to pick up the existing camera from your daughter is the best solution).
You don't seem to want or need any more resolution; you haven't identified any particular 'advanced' sensor features you need; and no especially demanding robustness criteria either. You don't seem to have a strong desire to switch to mirrorless (or any obvious reason to do so).
In short, based on that, keep using what you have, or buy a used DSLR of whatever vintage turns your crank.
There are a few hints in your discussion you might want something smaller / more compact for carry-around purposes. The easiest would be something within the same camera-mount family, possibly an aps-c version.
If you wanted to experiment with something smaller and segment/differentiate your 'carry-around' photography from 'more serious' (better phrased as 'requiring more/larger equipment'), you could supplement your DSLR with anything from a compact camera to something like the micro four-thirds and a couple small primes.
My answer to your original question is I'm quite happy with robustness and features and handling of my Nikon d750, and any number of Nikon DSLRs of similar/more recent vintage would be fine, too (adjust to taste). I suspect even the cameras of a photocopier or television manufacturer would serve well enough, too.
I also use an Olympus m4/3 camera for fun/carry around/don't want to carry the larger camera purposes. It does not feel as tank-like as the Nikon but that doesn't mean it's actually fragile.
Lots of variations on these themes (different manufacturers) would likely fit your needs pretty well, at least until some compelling 'advanced' feature is identified.
Or put differently, sounds like you might be over-thinking it a bit; what you have is probably working pretty well.
With great responses which are coming here it seems what Canikon DSLRs holds "robust and advanced digital camera" pedestal. I could switch from 5D MKII to 6D MKII to have robust and even more advanced.
It is also digital Leica for some.
The problem is with weight and bulk of DSLRs. I'm not 50 years of workout experience with full DSRs bodies superman. I'm just regular slacker who likes to take camera everywhere, everyday. I don't like EVF, because in everyday use it is constant saga with batteries and charger(s).
Just a screen is not cool under bright sun. Phone or Ricoh. The same difficulties with sun.
Digital Leica M240 series also came as robust here. It was suggested to me as daily beater years ago here. Maybe I should not be afraid to use my M-E 220 more often and start to save for M240 series cameras, once M-E 220 works no more.
It just... No Leica service in Canada and if needed, way too expensive.