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Some quests do make NPCs disappear, for example: Lassar disappears when you have a certain episode in progress. Just look through your quests thoroughly and see if you have anything that would relate to her being gone.
If you still can't find anything, you can inquire about it with Customer Support, but usually NPCs disappearances are related to having a certain quest in progress.
I am able to see her, despite not having started any G17.
Is your quest still in your quest window? Normally you'd deliver the items, and then hit "complete" on your quest in the quest window and it'll give you the requirement fulfilled.
If this is not the case, you'll have to post a video showing you having the quest, having the Monkey Fur, and delivering it to the NPC and afterwards, getting stuck according to your post, as well as your IGN/Server.