I can't answer for the creator, nor can I placate the feelings of the fans who paid for QC, but finishing a writing project (and an interactive, multimedia one at that) is really tough. I know: ideally, creators should know their limits so as to avoid making promises they might not be able to keep. However, that assumes that creators know their limits, or that there will never be factors that change their current capacity to deliver.
If Agashi/Lee simply didn't know her limits at first, then I won't fault her for it. Nonetheless, some of the fans who paid want some sort of accountability, even if it be mere updates. Making mistakes is okay, but not making up for it might not be. Feelings like guilt, shame, and self-deprecation are not what the fans truly want from the creator. They want the game back. They need a response.
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With regards to the creator taking up a story consultant role for the other VN, I will not take it against the creator. Sometimes, juggling WIPs really is better than a total writing block; it's natural and writers' lives don't revolve around writing anyway, no matter what they say. But as for why there are no updates for a BACKED game, my fingers are crossed that the creator will overcome whatever it is that's been hindering the her from making updates.