She was in the solitary forest separated from you, poorly and having no control over herself and hence she was carried away by the Raksasa Rāvana having enough prowess in him.
रावणेनापनीतैषा वीर्योत्सिकेन रक्षसा। त्वया विरहिता दीना विवशा निर्जने सती।७।।