I went to the website,
jewishgen.org/ShtetlSeeker/LocTown.asp
and typed in
SIEKIERCZYRNA and came up with no location in Poland with this name.
I typed in SIEKIERCZYN and came up with many possibilities.
Give it a try and see if any of the places might fit in to your search.
This is a very helpful website. Good luck!
I am almost certain that they are the same village. This was a German village until the end of WWII (1945) and its name was Geibsdorf. I was born there and I too am searching for birth records. Mine and my sister's. I don't know when your grandmother was born, but if she was born between the years 1939 - 1945 there are no records of any kind. All records for that period were completely destroyed. If she was born before those years or after those years some records are available in Lauban (Luban- in Polish) and Berlin.
I hope you find what you're looking for.
Regina Wiegand