She left the Vault three days ago. It was an unexpected event, since the Vault's water pump malfunctioned and the whole are got flooded. She wandered over the Wasteland without any food and water, yet still having enough of willpower to survive. The third day luckily she have found the Red Rocket abandoned gas station, and within the station there was a fridge.
The fridge was full of melon pieces, razorgrain, tato and a bunch of suspiciously looking meat of unknown source. Being hungry for three days she eat all the content of the fridge with a mix of frightened greed on her face, not realising that all that food was spoiled and half rotten. A sudden burst of need to release all that content through her large intestine appeared instantly, as all the hardly digested food exploded out her asshole. With massive pain on her face she realised that she alerted two huge Super Mutants in the nearby and realising in the last moments that the beasts will grab her, all she managed to do is to
climb on top of the gas station, leaving almost all her clothes, pants and panties behind.
The mutants were not stupid, they camped inside the gas station waiting for her to get
hungry again or get a fewer or radiated cold. Sooner or later she will have to climb down...