searching for parents of isabel martin

hi im searching for the parents of isabel martin who is my 3rd gr grandmother. she was born about 1825 in mexico and death dates is unknown at this time. her father is a lucas martin and a woman by last name of gregoria. i would like to know the mothers name as im currently working on my family tree. any help would be appreciated. i currently have a folder on here that anyone can view as follows http://www.nuestrosranchos.com/en/stephmartinez316

thank you for your time my name is stephanie martinez