How much Cherokee genes might I have ? (1/4?; 1/16?; etc)?

So on my mother's side my ancestry only goes back to a full Cherokee woman married to a Black man. Their names I know too; Frank Thomas, but who was soon Lewis becuase of Dave the slaveowner's last name. His Cherokee wife, Martha or "(Grandma) Rush"(wherever she got that name) also took both those last names. They are my great-great-great grandparents. My grandmother has blonde, long fine hair. Different families in the same area (Shady Grove, NC or nearby) eventually married in my family's ancestry more recently over time. They were known to be lighter than my part of the family. Btw All of this doesn't include my Dad's side of the family lol. Im sorry if this confuses those trying to help me, and I'll try to add more if that happens