Amy is not listed on the quests portion of the lefthand sidebar but there's an achievement for her quests?
Amy is deep in the clutches of Merana, so you can no longer do this quest or get the Achievement for it.
A little more backstory, she was drowned during the Omen Islander war a few years back. Her sister, Sarah took over her quests, and they're now Sarah's Quests. There is some speculation that she might have returned as Elsie, the shopkeeper for Half Baked.

We weren't really trying to save her, once she died...but no, she's been sort of long since dropped. Last year, we got an entire week of tribute items to her death, but it's not even a thing to rescue her.
I would also let you know, if you're going through and trying to make a push for achievements, there are probably going to be quite a lot that you'll find you're unable to get, since they're never blasted listed as 'Retired' anymore ;~;
Yes there are a TON I can't get anymore, which makes me annoyed since I left Subeta upon the arrivaal of users creating their own attire. But now I'm back and trying to do good regardless of my handicapt. ;-; lol But it's me own dern fault!! ugh
no one every really said this, but Amy died. That was the end of the plot. Her quests closed up, end of story. There were so users who thought Elsie the Zombie looked like her, but staff never said if it was her or not. Officially she is still dead. We even once had a Childhood Week in memory of Dead Amy.
If you want to read the story of The Battle for the Omen Islands, which resulted in Amy disappearing beneath the surface of the ocean, you can do so HERE.. Seems some of the images are now showing as broken links unfortunately but still worth looking at.. You can also find links to other past events HERE
Actually this year (sometime in 2012, technically) they did sort of a memorial, several of Subeta's younger or child aged NPC's released an item each as a free gift for about a week. I think something like it may have happened last year too...not entirely sure though.

: This page is amazing as I do LOVE lore/historis on Subeta's incidents. Thanks much for the referal!
: I can only hope there is a similar event since I am back now and as addicted as ever! lol
Yes, I do remember something of the sort happening in 2011 too...
My webcomic - http://bld.smackjeeves.com