A 21-year-old sister of the child returned to her Roma family in Ireland, who can not be identified for legal reasons, said their mother had not eaten for three days because of she was so distraught.
"Everyone was very sad," she said. The sister said she hoped no other family would have to go through a similar ordeal.
"The most important thing now is that my sister is coming back," she said. The sister said she supported calls by human rights campaigners for an independent investigation into the cases.
She added that neighbours, family and friends were very supportive to them during the last number of days.
"We are very happy," she said. "We will have a big party. We will have music, dancing, everything."
More top news
Read Sadiq Khan's full victory speech, as the Tooting MP promised to be a mayor for "all Londoners".
Former footballer Frank Worthington has denied he is suffering from Alzheimer's - a day after his daughter said he was.
A list of results for London Mayor and the London Assembly