Damn, and I had the olive fork all ready for you.
It's a lovely, delicate thing, just like the moment it describes. I don't see decay in the images, at least not at (heh) first blush. I see the leaves green and alive on the tree, the breeze fresh and rousing, and memories as thrilling as the carousel ride.
But that said, there is your title -- which implies that this fragile, poignant moment might not be all it seems at first blush -- and the first two lines, which tell us that her acquiescence was fleeting.
Then too, the word "acquiesce " implies a certain reluctance -- going along with something quietly, but not enthusiastically. It is not quite agreement, not quite surrender -- and here it is only for a a sliver of a moment, so it is temporary.
And of course, I suppose all leaves do decay eventually, the passing breeze dies, and the carousel must stop sometime.
I would reconsider the olive fork in light of that, but the poem is too lovely for me to insist that the ephemeral sliver of an uplifting moment you've provided continue into eternity (particularly as no uplifting moments ever do). You may keep your eyes.