Since you clean up the yard maybe she needs her scent put back there ??? so I suggest when she goes inside scoop it up and put it put it outside so she can smell her scent or mark again. Also try walking her before you tie her up I walk my girl when I
come home first thing and just a small stroll is enough exercise to make her have to go potty ! Can't hurt to try ! Goos Luck Kathy and Katie