Some adoptions are now what is known as open adoption whereby the child has opportunity ( age appropriate) to make contact via occasional visits , letter writing. & all information supplied at I think age 16. It always depends on current circumstances & the eventual wishes of the adoptee.
I do so hope that your daughter can look ahead to when she will be able to see her child & hopefully have got into a better position where she will not be able to be denied the chance. Try to get her to look ahead & realise that all is not lost ,she will have a chance to prepare for their eventual reunion when hopefully everyone is in a better place , best wishes , please tell her it can all work out never give up