DUKAT: And who's going to stop us?
SISKO: I am.
DUKAT: You can't even stand up.
WINN: Then I'll stop you.
(Winn raises the Kosst Amojan above her head, and it vanishes to reappear in Dukat's grasp.)
DUKAT: Are you still here?
WINN: Emissary, the book!
(Wraiths surround Winn and she bursts into flames.)
DUKAT: Farewell, Adami

Kai Winn is dead, not just trapped. As further evidence, here are some notes from the DS9 companion courtesy of Memory Alpha where they specifically reference the scene as "Winn's death scene":

Louise Fletcher was eager to learn precisely what Winn's fate would be. "I kept waiting and wondering how they were going to deal with her demise," she related. "I don't think they really knew. I don't think they knew until zero hour how they were actually going to do it." Once she found out how Winn was to die, Fletcher believed it was a fitting end to the character. She laughed, "I thought she got her just deserts." (Cinefantastique, Vol. 32, Nos. 4/5, p. 68) It likewise made sense to Ira Behr for Winn to be killed specifically by Dukat. This was because the pair had had sex and, according to a horror movie cliché, characters who have sex end up dead afterwards. (Star Trek: Deep Space Nine Companion, p. 709) Filming Winn's death scene was quite straightforward. Remembered Allan Kroeker, "We told Louise Fletcher that the Pah-wraiths were going to come out of the canyon and wrap around her like a serpent. Then she reacted in such a way that would help sell the effect." (Star Trek: Deep Space Nine Companion, p. 710) Fletcher herself, however, said, "It's hard acting with nothing, imagining what flames feel like." (Cinefantastique, Vol. 32, Nos. 4/5, p. 68