Celia

Celia (known as Mama to her "children") was a vampire of unknown age who created a "family" of vampires by turning four young men, three of whom were named Connor, Dale and Cody into vampires. At some point a long time ago she had a daughter named Alex who died of unknown causes. To replace Alex and fill the hole in her life, in 2006, Celia kidnapped a young girl named Annie Jones and made her a member of her "family," renaming her Alex and using her as a lure for prey for her and her "family." However, she didn't turn Annie into a vampire so she could watch her grow up. In 2014, while Celia's "family" was out on a hunt, Annie ran away out of guilt over her actions.

History
After learning that Annie has run away, Celia and her "family" work to track her down, hunting down the two bus station workers who helped her flee town. Celia is angry when one insults her "family" and after getting what they need from her, has her "sons" kill the woman. Celia, Connor and her other son leave for Sioux Falls, South Dakota where Annie fled to, leaving Dale to dispose of the bodies in a woodchipper near their nest.

In Sioux Falls, Celia and her "family" travel to the police station where they beat the location of the cabin Annie was taken to out of Deputy Frank, but leave him alive. At the cabin, Celia stays in the truck while her "sons" kidnap Annie and knock out Sheriff Jody Mills who was looking after her.

Returning to the nest, the vampires find Dale dead due to Sam and Dean and Celia forgives Annie and asks her to become a vampire. Annie agrees and Celia turns her. Shortly afterwards, Sam, Dean and Jody raid the nest and Jody finds Annie. While Jody is distracted with Annie's new state, Celia knocks her out from behind. Celia tries to get Annie to feed off of Jody and finish her transformation into a vampire, but Annie refuses as Jody was so good to her. Jody realizes that Celia is trying to use Annie to fill the hole in her life created by the death of her daughter, similar to how Jody is trying to fill the hole left by the death of her own family at the hands of zombies. Celia admits this, but then starts beating on Jody before going to feed from her. Before she can, Annie injects Celia with dead man's blood, incapacitating her. Celia is stunned and angry at Annie's betrayal, but Annie just apologizes. Telling Annie not to watch, Jody decapitates Celia, killing her. At the same time, Sam and Dean kill her two remaining "sons" and eliminate the last of Celia's vampire "family."

Afterwards, as Annie never fed, Sam and Dean are able to use Celia's blood to make the cure and turn Annie back into a human.