Her name was Mieczyslawa Bak
You probably already know this, but just in case, the Polish letters will also be useful in searching records...
He name was probably Mieczysława Bąk.... (Bak is not a common last name, Bąk, pronounced "bohnk" is far more common... )
Jozef is Józef in Polish and Czopor and Czopór are both names...
Your best bet is probably trying to find Polish organizations that might have records in the Popławy or Lviv area... most Polish people from around that area would have been resettled in what is now western Poland (so finding them would not be easy at all) but there still are some Poles around there...