I thought the whole point was that despite the daughter being something Gatsby wanted to efface entirely in his bid to recreate the past, she is a symbol that he couldn't. She's like a living symbol that as much as he wants not to exist, does, and is an uncomfortable and ineradicable reminder that Daisy and Tom happened. It's not a flaw in the book - we are MEANT to be annoyed by the poor kid's awkward and uncomfortable "offscreen/offpage" presence because Gatsby is. If she didn't exist, there would be no uncomfortable presence lingering in the background and Gatsby would have been able to fantasise that Daisy and Tom were never really together.
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