EITHER Mable the Maple is dying, or she is Fall-ing. I am assuming the latter.
I had a brief scare because the pot I had for her didn't have proper drainage and it poured for two weeks straight. I was dumping pools of water out off of the top of the pot. It was sad. JewishGuy was very nice and drilled some holes in the bottom, letting waterfalls of water out. Thank goodness (and JewishGuy).
So I think this is just the normal thing that trees do in the Fall and not some awful backlash from the bad drainage that was going on for the first two weeks of its life in this pot.
Coming soon: my video ode to Fall!