I do realize that Rose's maiden name was Blower. What I was suggesting is that perhaps the person buried as Rose Rees might possibly be your Rose and that you could find that out by checking the particulars of her grave.
It might be a false lead but, for me, the similarity of last names, the same first name, burial in the same cemetery as Thomas and Elizabeth would make me take a second look at it. My husband's grandmother was a Lachappelle but her headstone was misspelled as Lachapple - anything is possible with names in genealogy!
Debbie