A series of photos on Instagram on Sierra 's trail then goes cold . On January 21 , she messaged her sister to say she was glad to be heading back to New York . She flew to California alone after making friends there online . The mother of Sierra has n't been heard from since January 21 and did n't fly home the next day . Her husband , Steven , says he has no clue as to what happened to her .
A series of photos on Instagram on Sierra 's trail then goes cold . She flew to California alone after making friends there online . The mother of Sierra has n't been heard from since January 21 and did n't fly home the next day . Her husband , Steven , says he has no clue as to what happened to her .