Work out what the outdoors was actually giving her
A cat who ranged outside had a working day out there: hunting or at least stalking, patrolling a territory and refreshing scent marks, climbing, watching other animals, chewing grass, and choosing from a dozen sleeping spots as the sun moved. Indoor life fails a former outdoor cat when it replaces all of that with a bowl, a sofa, and nothing to do. The transition succeeds when you deliberately rebuild each of those jobs indoors, in smaller form, rather than expecting her to be grateful for safety she never asked about.
The first weeks set the tone. Going cold turkey on the door while the house is boring teaches her that indoors is a prison with good catering, and her campaigning at windows and doors will be loud and persistent. Starting the enriched routine on the same day the roaming ends gives her new patterns to build instead.
Rebuild hunting, eating, and patrolling indoors
Two or three interactive play sessions a day with a wand toy, run like a hunt with stalking, chasing, and a final catch, then followed by food, cover the hunting drive better than a basket of mice she must animate herself. Scatter part of her dry food or use puzzle feeders for a portion of her meals so eating involves searching and working, the way much of her outdoor intake once did.
For patrolling and watching, give her height and views: a tall cat tree or cleared shelves forming a route around a room, and a deep window seat on the busiest outlook your home has, where birds, neighbours, and weather provide the television she used to watch live. Scratching posts near doors and room entrances let her keep marking the territory she now owns. A tray of cat grass grown from seed gives her the chewing she previously found in the garden.
The door campaign, and how to outlast it
Expect testing. She will sit at the door she used, call, scratch, and attempt to slip out when people come and go, and she will redouble the effort at the times she used to leave. The household rule that matters is total consistency: nobody lets her out for a quiet life just this once, because one success converts a fading habit into a permanent negotiation. Manage the doorway itself with care during this period, checking where she is before doors open, and consider a double-door habit of closing one before opening the other at the busiest entrance.
If she takes to a harness, short, supervised garden sessions can soften the transition, letting her keep grass, smells, and air under your control while the indoor routine takes root.
Watch her weight and her mood through the change
A formerly roaming cat burns fewer calories indoors while often eating the same amount, so weigh her periodically and adjust portions before the gain creeps up, choosing play as the first lever since it serves her mood and her waistline together. Boredom in a cat who cannot go out shows up as over-grooming, night-time restlessness, aggression in play that turns serious, or toileting outside the tray; treat those as signals her indoor provision needs strengthening first, and speak to your veterinarian if they persist, since pain and illness can wear the same disguise as frustration.
Most cats, given a genuinely busy indoor life, stop campaigning within weeks and convert their energy to the new routine entirely. Some older former roamers simply move their sun-following nap circuit indoors and wonder what the fuss was.
Schedule the indoor routine across the household
Enrichment decays when it depends on one person's memory, and a missed play day lands hardest on a cat still adjusting. KinsLe's Care Teams lets you assign her daily play sessions, puzzle-feeder refills, and harness outings to different family members for each day, with completed tasks marked and timestamped, so her new indoor life runs at full strength even when the household is busy.