Trudy was born in 2252 to parents who were among a group of travelers. Trudy grew up among the travelers, and when she became an adult she, along with other new adults, were the only ones still in the group. She decided to settle in the spot where Goodsprings, NV used to stand. The other members of the group followed suit, and the town of Goodsprings was born again, with Trudy as the mayor.
"I'm pretty sure the NCR wants to hold onto the Dam because it's one of the few places around that can make electricity. The Legion are a bunch of savages, though. No idea why they'd want the Dam. Probably plan on destroying it or something."
ps3 Trudy can sometimes wander off from Goodsprings and walk to Hidden Valley. The reason for this may be killing Sunny or Ringo while still maintaining a higher than neutral reputation with Goodsprings. [verified]