Samantha Stewart, 21, from Breich, West Lothian, appeared at Livingston Sheriff Court yesterday in connection with the death of Nattalie Muir.
Stewart made no plea or declaration, was committed for further examination and remanded in custody.
Ms Muir, 21, was found in Whitburn town centre on the morning of 11 December and was taken to Wishaw General Hospital, where she died.
Last Friday, 19-year-old Emma Merrilees was charged with her murder. George Stewart, 34, from West Calder, and a 15-year-old Whitburn boy, who cannot be named for legal reasons, have also been charged with murder.