Can a cohen marry the daughter of a convert woman? (I have to precise that the mother converted to orthodox Judaism before getting married and before conceiving the child - which means the child was born Jewish and by extension her mother was also Jewish as she converted before getting married) If not, what are the detailed reasons/explanations behind that would not allow this union? Thanks

The Shulchan Aruch (Even Ha'ezer 7: 21) states that a cohen may marry the daughter of a convert woman, if the woman alone is the convert. However, he may not marry the child of a union in which both the mother and father are converts.