Jessica's Origins
First of all, I think Maine was a perfect place to be Jessica's home state, because Mainers I've noticed tend to have an accent that's a mix of Northern US and Canadian-British, so Angela Lansbury's sometimes obvious British accent doesn't seem out of place.
But I couldn't remember if Jessica is a native Cabot Cover.
I remember her talking about her and Frank buying the house as newlyweds, and that she was a teacher in Cabot Cove, but there's just something about the vibe that makes it seem like she wasn't born and raised in the Cove.
I know part of it may be that she basically becomes famous in the first season, but she doesn't have any close female friends; even the ladies at Loretta's are more acquaintances. She's sometimes on committees, but nothing weekly like a craft club or book club or garden club... or bike club! She doesn't have a group of friends over for tea (except Ethan or Seth, but not a group), she doesn't host parties or teas (unless it fits into the story); same with being invited to them... she just seems like an outsider.
I know that many small communities consider someone an outsider even if they've lived there for decades, this is why I wondered about that dynamic.