"fleadh recorder" - I don't doubt "GSS" when he says that the lady in question won an All-Ireland title playing an English concertina, as opposed to the more common Anglo, but there's a lot of information being left out. It would seem not to be in the Senior category which is what your "Wikipedia" list concentrates on, so what age-group was it, which year, and maybe more importantly, how many competitiors were there? Was it more than 1 ? Did she win in solo competition, or as part of a duo, trio, or even ceili band ? We're not being told.
Apologies for diversifying from the thread, but it was "GSS" who brought it up, and I am genuinely interested. If no answers are forthcoming here, I'll make a query with Comhaltas, because it's such an unusual - if not unique - occurence.