Struggling was useless, but still Martha tried; she wasn’t about to simply stand there and let these people bind her hands behind her back. She tried talking to them, even yelling at them, but it made no difference; they held her arms in an unbreakable grip and as soon as her hands were secured, marched her away like a prisoner. As far as they were concerned, she supposed she was.
Well, she wouldn’t be a prisoner for long; the Doctor would find and free her, because that was what he did. All she had to do was wait for rescue.