The teenager, named only as Pamela, had her first trio of daughters when she was 15, adding to the son she'd had previously at 14.
The new triplets are all girls, and although they were born prematurely, they and their mother are said to be doing well.
Pamela - who turned 17 at the beginning of this week - and her family already receive help from the provincial authorities, which donated land and built them a house when the first set of triplets was born.
Pamela's mother, who cleans houses to support her daughter and grandchildren, says they will now seek more assistance from the government.
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