The meaning has become vulgar. Don't read it as "fucking," read it as "having a pedigree from," in the context of how class and bloodlines have been traditionally important in England.
But more importantly, it's just an idiom. She's given no thought to the word "born" or "bred," individually. She says "born and bred" because that phrase as a whole means, "I have lifelong roots in this place."
The meaning has become vulgar. Don't read it as "fucking," read it as "having a pedigree from," in the context of how class and bloodlines have been traditionally important in England.
But more importantly, it's just an idiom. She's given no thought to the word "born" or "bred," individually. She says "born and bred" because that phrase as a whole means, "I have lifelong roots in this place."