Only very few of the church records have been indexed so the search function is still more or less useless. You will have to dig through the books themselves. They can be written in German, Czech or Latin, depending on the pastor back then.
Interesting about that birth date though - it may well be an error but she could also be from a different line of Czalauns. Do you have a marriage record of her or do you know where she married? By the way i made a mistake in my earlier posting, the Josefa i have here is actually the daughter of my 4x grand father Tomas Czalaun and his wife Maria Anna Pimperle. Got the generations mixed up.
alright I have the marriage of Josepha Czalaun and Jozef Polacek in my files, Sept. 3 1844 in Herzman.
So yes, we are related here.
This is the relevant page: http://digi.ceskearchivy.cz/de/3516/103