What was mama afraid happened to her husband (act 1 , scene 2)

I'm not sure what you mean here. Mama knows her husband is dead. Asagai leaves, and the family returns their attention to the insurance check. The check arrives, and Travis brings it to his grandmother. The family is at first very excited, checking to make sure the amount is correct. Then, the gravity of the situation hits Lena. As she realizes this the compensation for her husband's life, she sobers and says, "Ten thousand dollars they give you. Ten thousand dollars."