“The point of Da’atan Kalos is that she had no desire on her own, she was won over.”
Which is more clearly spelled out in Rashi in Kiddushin peh amud b. The mishna says 2 woman are not a shmira for each other regarding yichud with a man. The gemara says it is because “ndk”. Rashi explains each one can be persuaded to sin (and the other one knows the possibility exists) so neither is worried about sinning and the other finding out. “Persuaded more quickly” is how Rashi interprets “ndk”, at least in kiddushin.