she were born in Polana in 1920
You meant Polana - a town, or maybe it was a typo and it should be Poland? Anyway, place of birth, residence would be helpful to know for further research. As you mentioned, the family was big and probably some of it is still located in same or nearby area. The map of Polish surnames however shows that here are almost 4.000 people registered with this name. They are spreaded all over whole country but most is placed in Silesia area.
moikrewni.pl/mapa/kompletny/kuczera.html