@Chinqz
Mostly this. The unsettling part of the ending is that after finding out she murdered her own sister she immediately becomes happy knowing that she isn't going to become ugly and starts dancing in front of the mirror for this
@Ulf_Jarl
Haibara would have recognized her if that were the case. Amuro is investigating her as he suspect she is involved with the Haneda incident because of the shogi piece he found during the previous case