We have the same case for my sister..my mother passed away feb 2015..her priority date was april 2007..we called nvc and told them about my mother..then we filed for humanitarian reisntatement..it was revoked at first because apparently they didnt receive the documents that they asked but we sent all the documents..we have to file for motion to reconsider and luckily they opened my sister's case again..and the rest is history..she's here with us in the US..