Assuming the burner account and the email sender are the same person, they had both her mother's address and her address down to the apartment number. That narrows down the possibilities even more.
I've tried to find her mother's address and was unable, but I'm not well-versed in locating Canadian addresses. (Her mother is Kim(berly?) Landry and she is married to Jean Landry. They presumably live in Cornwall, Ontario.)
If the leaker is someone who knows her personally, I hope they end up sharing some juicy details with us. If the leaker is Malan, Gnima, or Nat, that would be fucking amazing, and a wonderful Christmas present for us Karen Farmers.
I'm honestly surprised she wasn't doxxed sooner. I suppose an address isn't necessarily the norm for BP cows.