Why does it say that the ambush was resting for her in the room?
Metzudas David: She will tell him that Pelishtim are upon him. 1 If he breaks the ropes, she will say that she tested him. If he cannot break them, she will tell the Pelishtim to seize him.
Perhaps she said that she hears them outside, or she sees them through a window. (PF)
What is the meaning of "ba'Haricho Esh"?
Radak: When it is near fire, and the fire rules over (heats) it only a little, like a scent [already it breaks]. According to Targum Yonasan, the suffix Vov refers to fire (even though the verse explicitly mentions fire).
What is the meaning of "v'Lo Noda Kocho"?
Rashi: He did not need to strengthen himself (arouse his strength) to break them.