Board Thread:General Discussion/@comment-34639978-20180209202400/@comment-27136653-20180211052239

When you befriend Undyne, then kill Mettaton: https://drive.google.com/drive/folders/0B6gS2LPXdIc5QjRzNmdqZnJsMk0

By the looks of things, Alphys commited suicide. Presumably, because of Mettaton's death. After all, that is one of the conditions here. And she did look very distressed when she saw the outcome of our battle with Mettaton EX, no matter what the outcome actually was.

She also wouldn't inject herself with DT, knowing very clearly what happened to the amalgamates. They didn't disappear. This wouldn't make her disappear.