Myra was not stupid
It is always the wisest thing to act stupid. Your foes will let their guard down. You can work out a scheme to achieve whatever you want without being watched.
Think about it. Let the two men each pick a number. Whatever their guesses are, you can choose whoever you want. Well, she did not expect that Elya would give up. Or did she? We do not know. We never know her intent. We cannot simply assume she is stupid. Perhaps she expected everything and everything turned out as she expected. We never know.
Why am I concerned whether she is stupid or not? Is it really important? I really don't like this kind of assessment on the intelligence of people.
I want to get out. Is it by the biology that I'm destined to think like this? Because we are all social animals?
"It is our ability to collaborate that enabled us to dominate the surface of the earth over other animals. Everything was possible since we were social animals."
It would have been much better if we were not social animals. Or at least not I.