Sanctuary

Sanctuary is a 2008 - 2011 American/Canadian scifi adventure series that aired on the SyFy cable television network. It stars Amanda Tapping as Helen Magnus, a scientist who heads an organization that tracks down and assists (or captures, as appropriate) super-powered creatures and humans. Robin Deane, Emilie Ullerup, Chsirtopher Heyerdahl, Ryan Robbins, and Agam Darshi costar.

End of Nights, Parts 1-2 (Season 2, Episodes 1-2)
Ashley (Ullerup), Helen's daughter, is kidnapped by the Cabal and is transformed into a vampire-like creature. The Cabal brainwashes her into leading an assault on the various Sanctuary bases around the world, and she eventually faces off against her mother and her former allies.