Jo, I have reference to a Margaret Poorman b. 1800 in PA and d. 7-21-1858 in Perry Twp., Richland Co., Ohio.She is buried in the Pleasant Grove Lutheran Cemetery. I show her married to a Jacob Kuhn he is also buried there.
I have been to the cemetery but I do not recall seeing any other Poormans.The date you show for Peter could make him her father.Who and Where is the son you mentioned?
I also do not recall seeing an Elizabeth Poorman in the 1850 census, but she may have been there.
There were many unmarked burials in this church cemetery.