Hi Diana,
Their marriage was in Ballaugh, not Andreas. See scan:
familysearch.org/pal:/MM9.3.1/TH-267-12435-40362-26?cc=1784428
So she was likely to have been living there.
I assume you have seen Philip Radcliff's 1801 will transcript.
www.iomfhs.im/lawsons/LawsonBMD/twill/1801_008.html
William Mylrea a clue?
Sue