This was the hand that apparently lost it for them. Basically after the opponents opened 1♦ Anna bid a 2♦ Michaels bid, but her partner didn't get it and kept bidding diamonds, culminating in Anna playing a catastrophic 4♦x-7, for -1700 points, a catastrophe at total points scoring. Coincidentally, at Anna's table the final points deficit was exactly 1700 points. Over the three tables, Buchanan Bridge Club narrowly lost the match.
Here's the disastrous auction in full, with the North and South hands as best Anna remembers. Favourable vulnerability.
That auction needs an explanation. Since East opened 1♦, the 2♦ from South was a Michaels Cue Bid. It should have been alerted but wasn't. 3♦ from North was therefore a mistake. It looked like North-South might have got away with it when West bid 3NT, but still convinced of the diamond fit North now tried 4♦
I posted this hand on the Bridge Base Forums to ask what South should ethically do, read that here. Here's a summary of what the posters said:
By way of contrast, here's a hand where Anna got a fantastic result, making a slam that should never even have been close to making.