to be honest the trope 'the computer is a cheating bastard' comes into play on this one, there were plenty of times she outright went with a win streak and seemed to know what I was going to pick no matter what I tried, the premise was interesting but should tone back on the difficulty if the reward is not much, maybe next time have a difficulty system built in where they can pick how hard they want it and in return they get a certain reward for each difficulty?
Also learned about the secret button AFTER I already beat everything. so it is not exactly impossible just feels like the NPC cheats you.