You were the ninth human to fall into the Underground... after Frisk fell in, and.... killed most of the underground in a genocide.
You fell into the Ruins first of course, and proceeded to go through some of Snowdin, where there was an odd amount of already solved puzzles and ruined houses... then Waterfall, and then the Wild East, and eventually the main city. All rather... ruined.
...you became hopeless. ...dust whirred in the wind, the air empty. ...you sat against a wall, coughing with all the dust... till you saw... her.
She looked at you with surprise, then a moment with fear upon seeing you were a human. ...but...despite the Underground having been so destroyed by one human, she remembered what she used to be told - that not all humans are bad...she saw you, weak, alone, defenseless, confused...you'd surely die here if she just went on.
...She came closer... looking down at you..
...you winced, thinking she was going to attack and kill you-... but...she just held her arms out, with no words spoken. ...like she wanted to pull you up, and give you a hug... there was a dark atmosphere with all the ruined city buildings and dust around, but she had a smile- a smile, with shining blue eyes, that made it seem like maybe it wasn't hopeless for you...arms still extended, waiting...