Answer:
From the given passage above from The Odyssey - Penelope, the line from the passage that best shows that Penelope is clever is: and so for three years I deceived the Akhaians. What makes Penelope very clever is that, her suitors agreed with her condition which is she needs to weave the great loom. But never did they know that every night by torchlight, she is unweaving it and she'll weave it again the next day. And this went on for three years.
Explanation:
She does not seem impulsive: she seems to be working steadily towards the goal (defeating the Nazis) (so she is also not unsteady).
I think that the best word to describe her is "resilient" -for example because she went back to work after sustaining an injury.