They turned and followed her past a deserted playground, one of them bump-bumping a stick along an iron fence, the other whistling: these sounds accumulated around her like that gathering roar of an oncoming engine, and when one of the boys, with a laugh, called, “Hey, whatsa hurry?” her mouth twisted for breath. Don’t, she thought, thinking to throw down her purse and run.
Source: T. Capote: "Master Misery" http://www.sheilaomalley.com/?p=6786
What is the exact meaning of the last sentence? I guess that it could be paraphrased in this way: Initially she wanted to throw down her purse and run and in the end she decided not to do that. I suppose that this the sort of creative writing that does not follow the grammatical rules but is there some grammatical pattern from which this for me very unusual sentence is derived?