The nearest match I can find on 1880 census in Collin Co, TX is the Elizabeth listed below (I'm assuming it is a typo and your Isabell was born 1876, not 1976.)Note, grandmother in this household is named Isabell.On the 1930 census "Mrs. J.T. Foster" says her parents are both born in AL, that would match this family, too.
1880 census Collin Co, TX:
Category: Name;Relationship to head of household; Marital Status; Gender; Race; Age; Birthplace; Occupation; Father's Birthplace; Mother's Birthplace.
Benjamin F. ATHAYSelfMMaleW30ALAFarmerSCALA Martha A. S. ATHAYWifeMFemaleW24ALAKeeping HouseNCSC Benjamin F. ATHAYSonSMaleW8TXAt SchoolALAALA Susanah ATHAYDauSFemaleW6TXALAALA Elizabeth S. ATHAYDauSFemaleW4TXALAALA Durand P. ATHAYSonSMaleW2TXALAALA Martha L. ATHAYDauSFemaleW1TXALAALA Isabell HODGEMotherLWFemaleW52SCSCSC
Since you know full date of death for your Isabell, you probably know where she died, too.Have you obtained a copy of her death certificate?It should show the names of her parents.