living relatives
nasza klasa.pl
This is a very popular schools website, like Friends Reunited, but a thousand times better. People of all ages use it.
You have to join though and that might be a problem.
If you ask... someone might do a quick look-up for you.
continuing the search I guess.
Again, find a friend in the locality and ask them to help. You never know !
Find a message board for the nearest city or town and post a message.
What do you have regarding your Grandmother ?
Date of birth ? Baptism ? Marriage ? Details of people with the same family name ?
Or did you just look at some documents. ?