Cancelled flight...again.

My wife was booked on a flight from Sydney to Brisbane at 8pm this evening to make a connecting international flight to Europe from Brisbane...We drove several hours to get to Sydney from Tamworth.......the Sydney to Brisbane flight was then cancelled and passengers were informed there were no further flights available that evening.....needless to say all passengers were now stranded in Sydney. Of course my wife has now missed the international connecting flight and was meant to attend a wedding the following day.....what happens now..?? We drive back to Tamworth as it's pointless trying to get to Europe for a wedding she has already missed....She has lost the international flight, and you don't get a refund if you don't turn up or check-in, it's hard to check-in if you're not there to do it...... and as a consequence she will miss the wedding.