I'm reasonably sure the Auld Bessie connection is a product of the internet age. The 18th-19th century titles are one of a baker's dozen spellings of Garryowen.

Much bigger problem is an 1812 “Madame Mara of Drury Lane.” – The Drury burned to the ground in 1809 and the Madame was no where near England or Ireland from 1802-1819. Would you believe 1792..?!?

“The harsh receptions accorded Mrs. Billington failed to deter one of her rivals, Madame Mara of Drury Lane, from performing at the Limerick Theatre Royal during the next summer. She appeared along with Daly's Crow Street troupe for Assize Week, 20–25 August 1792. This year the playhouse rather than the players aroused public condemnation... The same critic blamed the Manager also for the 'disorderly and insolent behavior in the gallery' where the spectators 'resemble Savages'. If the Manager had shown the proper initiative and called on the 'magistrates', they would surely have assisted in preserving decent manners throughout the house.”
[Clark, W.S., The Limerick Stage 1736-1800, Pt.Two, 1965]
Gertrud Elisabeth Mara (1749–1833)