It's actually elementary. She knew Thu had learned his lesson and had enough. She may have known Huan wouldn't kill him permenantly, but she also wanted to ensure safety. So he crippled Sauron in all three forms (Gorthaur, Serpent, Vampire) and sent him running away with rapid loss of his black blood. How she knew Sauron wouldn't be back ever again in that age, let alone not reporting back to Melkor is anyone's guess. So you're a new reader to the Silm huh? Ah, those were the days. . . .
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"I come from yonder...Have you seen Baggins? Baggins has left, he is coming. He is not far away. I wish to find him. If he passes will you tell me? I will come back with gold." - Khamul the Easterling
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