Looking for Evidence of My Great Great Grand Mother Jemima Kember

My Great, Great Grandmother Jemima Porter died in Cardiff on Feb 21st 1890 where she had been living with her daughter and son-in-law Emma and Robert Porter. She had lived in Ashcott Somerset with her 2nd husband Francis Everdell and previous to that had lived with her 1st husband (?) Lloyd - can't remember first name without looking it up. She was born in Greinton Somerset about 1809 but her name does not appear in the church registers. Greinton was a small village and there wasa large family of Kembers living there with a space between children for Jemma's name to fit. Her father's name was George and the parents of the family previously mentioned were of a George and Grace Kember. I need evidence of Jemma's parentage and would like to know where the family came from. I have three photos of Jemima as an elderly lady.
Would appreciate any help.