looking for my sister and I never met her before! !

I never met my sis some people they might knw me by my nick name which is ponase bcs we grow up in pretoria that’s where the whole thing started, her name is Dimakatso mokoena born 86/11/14 im not sure where she was born , the only thing we hv it’s her birth card which my granny kept bcs she thought myb one day she will come for it, she never came so the thing is my mum she doesn’t wanna talk abt her or her wherb she is, so I would love to meet her some day , myb this cn help I hv a nick name frm where we use to leave in winterveltd , my mums name is Fridah Mamohlolo mokoena, plss I need ur help sis Andile!