This is Sakambhari, the goddess of Vegetation and a form of Durga or Mother Goddess. The identification is based on the attributes, leaves in her upper hands and her holding an infant. Sakambhari is means ‘grass robed’ or ‘possessing vegetation’.
The book on ‘Eastern India Bronzes‘ published by Lalit Kala Academi has an example, figure 246. Though there are a few Sakambhari temples, the above book is the only one I have come across with an example of bronze sculpture.
According to J N Banerjea ‘Navapatrika ceremony of the autumnal Durga worship in Bengal, which shows that the Devi was in a way personification of the vegetation spirit’. In the same book ‘ The Development of Hindu Iconography’, J N Banerjea traces the origin of Sakambhari to Harapan period.
This bronze is about 10 cm in height. It is from Bengal (West Bengal or Bangladesh). Going by the example in the book ‘Eastern India bronzes‘ this may date to the 10th century.