In the story, it's written that she has drowned a young girl. But it's not an actual winning, rather than it convey that the woman usually see a young girl in the reflection but as she got older, she couldn't see the beautiful reflection anymore.
So i think the most appropriate answer would be : Realized that she must forget the past
hope this helps
It is Subjunctive. Conditionals use "If"
A large car fire presents the possibility of many things for example, forest fires and explosions ext.