Unsound sacrifice for Maia

Former World Champion (1978-1991) Maia Chiburdanidze was playing top seed Koneru (2nd woman to cross 2600 Elo in the history) with black.

In this position she tried a clever exchange sacrifice : 17...Rxe4 18.Qxe4 Re8, with the idea Q moves somewhere then Rxe2 and then Qxf4. Do you see why it doesn't work ?