Joe - in his later years, Tommy Makem who popularized Dick Darby (the Cobbler) also sang "she's cracked".

When he first sang it years ago, he sang "she's black", and it had no race connotations; however, it's liable to be misinterpreted nowadays, hence the change.

Although someone who has a politically correct attitude towards terms referring to mental instability would raise an objection to "she's cracked".

So we'll have to change it again.

Seamus