Not being released immediately suits Beleth just fine, because she's not quite ready to let go of Galadriel. The panic and fear had escalated too far to simply be stopped by the disappearance of the monstrous creature, and even with it gone, she clings to Galadriel, struggling with her breathing. She considers it a personal victory that she doesn't just hyperventilate right then and there, but it's a small comfort when she's in tears, whole body shivering.

Her name dimly registers, and it's a few gasping breathes until Beleth can try to acknowledge the elven queen that she was clinging to. The first thing that registers is a deep, profound embarrassment. Once her breath is under control enough to speak, she immediately begins to apologize.

"My lady," And, slowly, her hands free themselves from Galadriel. "I am so, so sorry, my lady. I know it was a dream, but it felt so real. I could feel the heat. I could hear it."