Vault 13's water purification mechanism has been repaired and so Natalia's home is safe -- or it would be, if it weren't for those big green supermutants roaming around. Natalia is given a new task: find out where the mutants are coming from. She sets out once more into the wasteland with her companions Ian and Dogmeat, free from the restrictive time limit, and free to explore the wasteland at her leisure. There is a lot of work out there for a mercenary, and maybe while she's indulging herself she can gleam something about the mutant menace.
When I play, I tend to pick up all companions - Tycho, Katja etc. Still I see your gollowing the vault dwellers memoirs.
Also you guys mentioned Mariposa. In real life it is a military chemical storage center.
Enjoy the choices and i like how you play Natalia not as a pure good gal - but one driven by her own choices and quirks.
On a side note, never was sure why the overseer did mot send a party out - Albert Cole, Natalia and Max Stone. People who can get the work done but were probably a problem for Overseer authority.