Learn English – the meaning of a parenthetic ‘that one’ in a sentence

expressionsmeaning

“It is too ‘eavy, all zis ‘Ogwarts food,” they heard her saying grumpily as they left the Great Hall behind her one evening. “I will not fit into my dress robes!”

“Oooh there’s a tragedy,” Hermione snapped as Fleur went out into the entrance hall. “She really thinks a lot of herself, that one, doesn’t she? (Harry Potter 4 [US Version]: p.404)[Bold font is mine]

N.B.: Fleur is one of guest students from a foreign school. She is very proud. Hermione is one of the students in Hogwarts, the host school.

I’m not sure if ‘that one’ in this sentence means ‘that girl’ (a noun phrase) or ‘considering what she said’(an adverbial phrase).
I’d like to know the meaning of that one and its function.

Best Answer

It refers to the girl. "That one" is a somewhat dated construction, and expresses mild derision or mild admiration. All the examples I could think of sounded just like yours: "She/he is [adjective or noun-phrase], that one." Insert something like "a handful", "a beaut", "one in a million", "a piece of work".