Riann

From Memory Alpha, the free Star Trek reference

Riann was an Akaali that made first contact with Captain Jonathan Archer and other crewmembers of the Enterprise NX-01 in 2151.

As a trained apothecary, she was involved in researching a mysterious disease that killed her brother. She believed that a curio shop run by Garos was the source of the epidemic that was spreading among her people. She and a disguised Archer, who had arrived on the planet to explore and observe its pre-industrial civilization, discovered that Garos was really a Malurian whose mining operations contaminated the planet's water supply.

They were successful in driving off Garos and his cohorts, and after removing all of the mining equipment, the Enterprise crew provided a cure for the epidemic.

Riann and Archer had a brief romantic relationship before the latter left the planet. (ENT: "Civilization")