| Quote #4
Her small toad-like face looked even yellower than the day before. She was certainly ugly, and yet, like the toad, she had eyes like jewels, dark and imperious, revealing latent energy and an intellectual force that could be felt at once. (2.6.47)
Princess Dragomiroff exudes power. (And ugliness.)
| Quote #5
"I think, Madame, that your strength is in your will – not in your arm."
Though she is a feeble, elderly woman, the Princess displays strength of will.
| Quote #6
"It might be a question of the influence of mind over body," said Poirot. "Princess Dragomiroff has great personality and immense will power. But let us pass from that for the moment." (3.2.40)
Again, Poirot is able to judge the Princess's role in the plot.