I havent got a hope in hell have I?
Have a good look at: polishroots.org
JewishGen will give you help with regard to town village location. It's a very useful site.
You didn't name the actual town of village where your Grandmother was born.
Find the town/village and do a search for churches.
If one member of the family used the church then others must have done likewise.
Follow the link given by JustinL
Somehow you have to get as much info from that church, or it's records, as you can.
If you go to: (it's an english language website) polish forums. com someone might give you a list of churches, be able to tell you about the movement of people in the area or post a link to a relevant website. It really depends what you ask for. Although the site has a Genealogy section it doesn't mean it is full of experts, but there are people who sometimes try to help. You may be refered back to rootschat though.
Selizia = Silesia. An area of Poland.
Check other websites to see if family are looking for you. Genealogy.com, ancestry. com There are many people looking for Polish roots, people whose families were forced to break up, for one reason or another, mostly because of the political climate.
If you have any Polish documents: Post the title of the text and I'll translate it. Then you'll know if it's useful or not.
Was your Grandmother (Grandfather) naturalized. Check. You might find names and dates.
You don't mention your parents. can they tell you anything.
Find out as many names and approximate dates of birth as you possibly can. Some of these names will help you later with military records etc.
Did Grandmother have brothers and sisters ? What are their names ?
Look for all sorts of clues. Family photos, medals, old letters etc.