Fable Bright
Dana Lee Fallon (nee Montgomery) was raised in the Carolinas, where she was born. In 1856, she married a law-man by the name of Wyatt Fallon - a hard man with a thirst for justice and a seemingly bottomless need for wealth and success.
In 1859, the pair - still childless and looking for a life of adventure - joined a western caravan bound for what would become the Idaho Territory just a few years later. They settled in 1860 and helped found the town of Franklin, where Wyatt served as Sheriff.
Between their inability to conceive and Wyatt's late nights moonlighting as a Faro dealer (coupled with his proclivity for extra-marital activity), Dana fell into a sorry state of depression, and soon found herself lost in a near-hopeless Laudanum addiction. The two grew farther and farther apart, and when Wyatt was gunned down by an angry card player, Dana's primary concern was how she was going to care for herself.
Luckily enough, that was also when a traveling salesman called Julius Wynnfield rolled into town with his snake oil and tonics. Jules (despite stereotypes - and his dark skin tone), was a well-liked man, with the best of intentions. He saw in Dana, the need for healing.
Jules helped her with her addiction, and her depression, and she eventually left Franklin to travel with him, helping other people, and learning quickly that he was a vampire - and that he hid a third eye under his cowboy hat.
She spent a few years helping Jules, until the two were captured by bandits and locked up, for who knew what nefarious end. Through a convoluted series of misfortunes, the best way way for them to escape was for Dana to become a vampire like Jules. She agreed and was embraced - the two of them making quick work of the bandits (miraculously, without killing any of them), and the pair continued traveling and selling their snake-oil cures until the advent of the motorized vehicle.
Dana settled in Chicago for a little while, but like Jules, she preferred to travel - "Walk the Earth" as he liked to say - doing good deeds, righting wrongs, and seeking atonement for sins done in the name of survival. Eventually, she joined the Red Cross and got involved in organizing Blood Drives. In the 1950s, she helped organize the first Bloodmobiles, and has been using one ever since, driving across America collecting (and selling) blood, while doing what she can to make the world a better place than she left it.