Yeah this is probably the case, if someone who knows Baby Doe or her caregiver(s) is aware of the body being found.
IMO a lot of people in this thread are thinking up some very unlikely and far-fetched scenarios (I saw someone suggest her parents might be part of a traveling cult, and others suggesting she's the child of a long-term abduction victim a la Amanda Berry), while ignoring the most likely ones: that her family doesn't really watch the news, that they may have seen the news but have no reason to suspect it's their cousin/granddaughter/niece/goddaughter, her family is estranged from Baby Doe's caregivers and haven't had contact with them for a long time, or her family simply doesn't know she's even missing in the first place. Not to mention that police may have already received the tip that will lead to her identification, but they're so swamped with tips/leads from the public that it'll take a while for them to look into it. It hasn't even been a month yet.