Conversely, are there smells which cats find offensive which I might put in the corners of the easy chair?
Yeah. You can go a few routes on that front. Make your own with some hot pepper (little bit of cayenne or chili) and water, it doesn’t take much since they have sensitive noses. Or there’s stuff you can buy in the store, Boundary is one we’ve bought. Could definitely be the texture, the major types of scratch post/ pad are carpet, wound rope, and sideways cardboard. Might try getting the types you don’t have and see if the cat shows a preference. Another angle to try is putting the pad “in the way” lean it on the chair corner she shows a preference for, could be the cat just likes that chunk of the house.
Cats find dog poop and bear scat very offensive. Skunk oil is also very effective.
Regards,
peppermint