Eliza had known that something was up with the way the coordinators were doing things. She was aware since the case about the mini event. The was they had plotted the scenario with a mix of surprise to left the teams unprepared. She knew that after the friendly match, this would happen.
It could be said that you couldn't pull the same trick twice but it couldn't be applied to those three.
As a capable Acting Master of the Guards and her grandfather having connections with the Supreme Ruler, it was not difficult for her to obtain first-hand informations from her subordinates even His Majesty himself had know her behind the scenes movement but he just turned a blind eye to it.