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No. She was in a car accident when Claire was driving at a young adult age going through a possibly rebelious stage [hence the goth look] and was in a coma for an indeterminate period of time before awakening sometime after the crash of 815. She appears in There's No Place Like Home Part 1 to inform Jack of his relationship to Claire and her belief that Claire died in the crash. She is then seen suing Oceanic Airlines in The Little Prince by Jack and Kate. In Whatever Happened, Happened Kate decides to go back to the island to look for Claire and leaves Aaron with Claire's mother, telling her that Aaron is her grandson and that Claire is alive.