Inherently wrong as in basically wrong. She may have heard it and then repeated it incorrectly. Just as I would describe 'Me ears are alight' in Desmond Decker's 'Israelites' as inherently wrong. Apologies if the word inherent is misleading but I have neither the training or inclination to make sure my wording is perfect here :-)

Of course we could go on to say that changing words when transmitted by word of mouth this is part of the folk process but do we really want to get into "what is folk" yet again?

DtG