Regarding Aunt Marge's inflation, I don't remember ever reading in the books that she was ever restored (deflated). Nor was it seen in the films.
Did that ever happen? Or is she still out there, floating?
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Yes, Aunt Marge was successfully deflated!
"Eat, Harry, you look dead on your feet. Now then... You will be pleased to hear that we have dealt with the unfortunate blowing-up of Miss Marjorie Dursley. Two members of the Accidental Magic Reversal Department were dispatched to Privet Drive a few hours ago. Miss Dursley has been punctured and her memory has been modified. She has no recollection of the incident at all. So that's that, and no harm done." [Cornelius Fudge, Minister for Magic]
Prisoner of Azkaban - page 44 - US Hardcover
In the film, Fudge basically gives the same speech as quoted above when Harry arrives at The Leaky Cauldron, as if he's dictating a letter to Harry. In the film they do not show Aunt Marge being deflated. Fudge just notes that she has been and that her memory has been modified.