Start from the territory she already patrols
A rural cat is not short of height outdoors — fence posts, barn rafters, the woodpile and the farmhouse roof all belong to her circuit — so indoor vertical space has to offer something the garden cannot, or she will ignore it. What the house can give her is a warm lookout over that same territory and a high sleeping place for the hours when she is inside: overnight, during storms, or when visitors' dogs are in the yard. Design the indoor route around those two jobs, and accept that on a fine morning she will still choose the barn beam; the indoor route earns its keep in the hours the garden is closed to her.
The window perch is the heart of the indoor route
Put the best indoor perch at the window with the widest view of her ground — the garden, the lane, the bird table — deep enough for a full stretched sleep and lined with a washable pad, because a cat coming in from a large garden brings mud, seeds and the occasional burr in her coat. Build toward it in stages: a heavy scratching post by the door she uses, a cleared shelf or dresser top as the middle step, then the perch itself, so arriving wet from the garden she can climb and settle without crossing beds or kitchen counters. A second high platform in a quieter room, away from the window's excitements, gives her the dark, undisturbed sleeping height she would otherwise seek on top of a wardrobe.
Mud, seasons and the working rhythms of a rural house
Indoor height for a garden cat lives a harder life than a city cat's shelves. Pads need washing more often, the post by the door becomes the unofficial paw-wiping and claw-sharpening station, and in harvest or lambing seasons the house fills with people and mud at all hours. Keep the route out of the boot room's traffic and away from where wet coats hang, and expect her usage to swing with the seasons: heavily on winter evenings and storm days, barely at all in high summer. That pattern is success, not failure — the route is her bad-weather territory, maintained and waiting whenever the garden stops being hospitable.
Safety where indoor and outdoor heights meet
The points where her two worlds connect deserve attention. If she comes in through an upper window or a cat flap in a utility door, make sure the indoor landing below it is a deliberate, grippy surface rather than a polished worktop. Check that no shelf route encourages her onto the kitchen's high cupboards where stored food and cleaning bottles live, and block the top of any dresser holding breakables with a box or a sloped board rather than relying on her good behaviour. Outdoors, you cannot cat-proof a farm, but you can avoid encouraging routes onto machinery sheds or grain stores by never feeding her there.
Keeping her indoor territory respected by a busy household
Farmhouses accumulate helpers, family and seasonal workers, and a cat's shelf can quietly become a dumping ground for post, hats and paperwork. Marking her route as hers — and keeping it clear — is a household habit everyone needs to share, especially when she is outside for most of the day and her claim is less visible. KinsLe Family Sharing puts her profile and care details in front of the whole household, including which window perch and high platform are kept clear for her, so her indoor height is still hers when she comes in from the garden.