My maternal grtgrt gdmother was Mary Elizabeth Heidelberg, b.1845 GA. She lived in Limestone Co., TX. When I saw your query about Irene, I looked in my records and found an Irene married to Harvey J. Heidelberg. She was 18 in 1920, so I think its not the Irene you are looking for. However, there are a lot of Heidelbergs in Cherokee Co., TX and Limestone Co., TX. Do you know the county in which she lived? Do you know her husband's name or the year she was born? The Heidelberg's I am related were from Onslow Co., NC; Randolph Co., GA; Jasper , Jackson & Jones Cos., MS; Limestone & Cherokee Cos., TX. Good luck!