relief, going off, blown

Learning that the bank card which I thought I may have lost has been found and is being kept safely for me by the supermarket where I left it.

One elderly lady to another in Chapel Place: "She always goes off ...wherever you are ... in the middle of the night."

Lots of things are blowing about in the wind: leaves, paper, feathers, thistledown. And there's a butterfly. Is it blown or is it flying?