Cynon Valley AM Christine Chapman said she had asked for the Children's Commissioner for Wales to get involved because she was concerned for Sarika's welfare.
An interim hearing will be held in the next two weeks to decide whether Sarika, the only Sikh at her school, can return to classroom while the case is continuing.
Sarika has refused to remove the bangle and her family has said it is an important Sikh reminder to do good with the hands, and should not be regarded as jewellery.