I know Amy killed Madame K in The Wedding of River Song (Season 6 Episode 13). But that took place in an alternate timeline. On the hand, at the end of that episode Amy is drinking wine because she is and she tells River
"I killed someone, Madame K."
however right after that River replies
"In an aborted timeline, in a world that never was."
So which is it, did she kill her or does it not matter because it was in an aborted timeline?