A feed of photos on Instagram marks Sierra 's trail then goes cold . She flew to Istanbul alone after making friends there online . The mother of two has n't been heard from since January 21 and did n't fly home the next day . CNN 's Ivan Watson and Mary Snow contributed to this report . Comment:
A feed of photos on Instagram marks Sierra 's trail then goes cold . She flew to Istanbul alone after making friends there online . The mother of two has n't been heard from since January 21 and did n't fly home the next day . Comment: