Howard, ALL WRONG I'M AFRAID
If you read the whole of this thread you will see that no-one is claiming the origins of 'The Gypsy Laddie' Child 200, as Irish. Anyone who knows anything about ballads is aware the ballad originated in Scotland.

In fact there are several historical events which could have led to the origin of this ballad in Scotland, apart from which it could also be totally fictitious.

Your information from her ladyship, however, is still of interest, but would be more useful if some dates could be attached to her story.