Jeesa had an affair with a woman who died and Urvashi was her daughter but not from Jeesa. But Jeesa brought her home and Maasa had to bear with Urvashi. Thats why Nahar was so impressed by Maasa and respected her more after learning the Raaz.
Later Urvashi turned out to be of evil nature and Jeesa did not like her either. Moreover, he was afraid that Urvashi might take revenge of her mother by hurting Tara. Therefore, before his death, he wanted to warn Tara about the danger. Since he could not, so he told it to Nahar.
Thats why he did not give anything to her from his property as she was not only not related to Jeesa but also was an enemy of Tara and his family.
Remember, Maasa was not surprised to hear the will.