You know Anonee this story line has given me a fresh perspective on this issue.
In the past whenever I have seen such an issue it has always resulted in the girl/woman being sent back to her parents home and is then more often than not treated as a burden by her S-I-Ls. And I have always felt that it was not fair to send the girl/woman back.
Here Jiji chose to do the opposite but standing back that was not the right thing either because Nadnini has been trapped in a time warp whereby she has all the trapping of being a married woman but none of the benefits - no husband to support her or defend her, no family, no real respect from society. This has left her feeling worthless and therefore desperate for any kind of affection.
So with hindsight I think in these situations it would be better if the person affected is supported in making the decisions about their life (I am not sure this happens in India at present except in the big cities) and if they chose to marry again they are not stigmatised.