In Panchali sabadham, bharathi also asks the same question. After Yudishtra lost himself in the gamble, he had NO right to make independent decisions as he himself is a slave.In panchali sabatham, i think Bhima gets very angry and says he'll break the hands of Yudishtra.
Also, i'm surprised that Saradhaji says Duryodhana can treat her in anyway he likes.This means that even the Kauravas treat her like a commodity.Both Pandavas and Kauravas are wrong. Nobody has right to treat women as a commodity.Draupdai is a human being and she has her own feelings and she is not an object or thing
Also, when she was being disrobed in fromt of the whole hall by dushashana, all the elders like BHisma,Drona,Dritharastra keep their mouth shut.It was Karna who gives this 'wonderful' idea of disrobing draupadi in front of all the people. Draupadi calls to Krishna to save her but actually even Krishna does not come to her rescue immediately.I read somewhere that draupadi surrenders totally to the Lord(saranagathi) and stops protecting herself from being disrobed. Only after total surrender , the Lord helps her.Till she was associating the soul with the body, Krishna does not come to her help.