Wouldn't that have been a second after she arrived in the 1800s?
That would depend on what she arrived with. If it was just the clothes on her back, not much. El-Aurians aren't Q. She might have been very active in the abolitionist and suffragist movements and later Civil Rights. She could have used any knowledge she possessed to push technology forward as well. We just don't know.
Yeah, not seeing a lot of evidence of Guinan having much tech at her disposal - she's defending her bar with a shotgun and a guard dog, and her car doesn't look like it comes with a warp drive.
Question: Does anyone else think the writers have decided to stick a fork in the Chris/Agnes romance?