Catherine Danckoff was born in April 1800 – but unfortunately, there’s a multi year in Sennigen, Luxembourg’s birth records, which includes 1800. I’ve turned to church records instead… and had no luck looking at Nierderanven, the closest church for digitized microfilms.
How do I locate neighboring parishes? The Institut grand ducal has a place names list that might prove helpful. It lists a locality name in French, German, and Luxembourgish as well as the overarching municipality. I can review each page for the municipality name and use that name to locate other parishes. It’s a long shot but worth a try!