Being made by the spirit from stuff it found in Tsudzumi's gourd would explain why the Tsudzumi double's got specific recollections while the Shinonome double's only really making a decent facsimile of the landlady's mannerisms but has got basically none of her personality. It'd only have Tsudzumi's memories of Shinonome to work with to make a doppelganger, and Tsudzumi seems like the sort of person to mentally file off a lot of somebody's rough edges.No way these aren't doppelgangers. Possibly made by that fern guy from a couple chapters back. The way Tsudzumi seemingly did not react to the news of stage 5 spirits is incredibly suspicious. But then how did she know about the glasses being a gift? Possibly something the fern spirit picked up on while rummaging in her brain?
Probably 18x more ambiguous in Japanese.The gramma spirit also said "I thought it was the landlady" down there but looks like Suzu didn't quite catch that, so there might be more than one copy