I claimed my mother last year since she stated that she was not getting a w2. However, she did get one after i had did my filing. what do we need to do?

I claimed my mother and sister since they where staying with me for 11 months in 2017. My mother was out of work due to back surgery. She was not expecting a W2, however, after i filed and completed my taxes.  my mother received a W2 int he mail.  Do we need to file it or what do we need to do?