She should also tell the reasons for doing that. she disliked ganga and she was afraid that ganga may become Jagya's wife.
Sumitra should tell how sanchi wanted her to go against ganga and how she herself happily did it.
she should also tell how her husband and DS tried to drill sense into her but she did not listen.
She should also tell that the sindoor and shaadi with ganga happened because she drove her son to do it.
She should tell that as a mother she failed.
It will give a clear picture.
And the judge will make observations how parental pressure makes kids vulnerable and take wrong decisions at wrong times.