When pitted against a rich girl with a well connected family, girls like Ganga lose out even if they are eligible in other ways.
It is not only a question of she being a yet to be divorced girl. There are so many other things too. Jagya has not yet started feeling anything like love for her. Only if he had felt that emotion, he would have point blank refused Sanchi. Ganga is treated like an orphan in difficult situation by all and nothing more. Only anandi knows. So it is upto anandi to seek some sort of solution for ganga in a subtle manner not offending her inlaws. Or Anandi should disclose to Jagya ganga's feelings for him and then leave the decision in his hands. She should also assure Jagya that he need not force himself into this marriage for her sake as she can take care of herself very well.