Soon after the matinee ended at 5pm however, NPOS put out a new media statement.
"It is with regret that the New Plymouth Operatic Society inform patrons that both this evenings and tomorrow's afternoon performance, are now cancelled due to illness."
A spokesperson said Catherine had "given it all" on stage for the Saturday afternoon performance, but was simply too unwell to continue with another performance in the evening.
The decision was made to cancel the evening show as well as Sunday's matinee, to give the director, cast and backstage team time to prepare for a change in line-up, with Jane now set to take on the role of Elphaba on stage as well as vocally.
The spoke person says ticket holders for either of the cancelled shows will be able to request a refund or to exchange their tickets for an alternative performance in line with Ticketek's policies.
There was a possibility of an extra show or two being added to the schedule to accommodate the number of people wanting to exchange tickets for an alternate date.
"We are in the process of looking at the possibility of additional shows and this will be announced shortly. We apologise sincerely for any inconvenience caused but as they say the show will go on next week."