She has fought against her husband and won the case over the property and as such it is self acquired property under Hindu law, she can dispose of the property, as she likes without any doubts. This is on specific property that she has won through process of court.
Your further queries are as under
So does she have any rights on the property of my father?
Yes. She is a mother and as such a legal heir of the property of your father. This issue further depends on several factors such as self-acquired, ancestral, written will or intestate etc.,
Do we grandchildren have any rights on the property besides what has been done will deed.
Grandchildren are class II legal heirs and only when there are no class 1 legal heirs you may get a share in those properties which was not disclosed in their wills.
It appears that you are having confusions and it is better to personally discuss with such local advocates.