Think in weeks and months, not days
A rescue cat arriving at your home has lost every familiar smell, sound and hiding place at once, so settling is a gradual rebuild of confidence rather than a switch that flips. A widely used guide runs in threes: the first few days are for decompressing and simply eating, drinking and using the tray in peace; the first few weeks are for learning your routines, voices and footsteps; and by around three months most cats show their real personality and treat the house as theirs. Shy cats, older cats and cats who have moved several times may run slower than that, and a slow timeline is not a failed adoption.
The first days: one room, low demands
Start her in a single quiet room with her litter tray, food and water placed apart from each other, a scratching post, and at least one proper hiding place such as a box with a blanket or a covered bed. Sit in the room reading or working and let her come to you, because a cat who chooses the approach trusts it in a way a cat who is picked up and carried around does not. Keep visitors, loud noise and meetings with resident pets for later. Eating, drinking and using the tray normally in this room are the first real milestones, and they matter more than whether she will sit on your lap yet.
Weeks two and three: routines become predictions
Cats settle by learning what happens next. Feed at consistent times, keep your comings and goings calm, and let her watch household life from safe vantage points before she joins it. Open the rest of the home gradually, room by room, always leaving the original room available as her fallback base. Play sessions at the same times each day do double duty here: they burn the nervous energy that fuels night-time racing and hiding, and they teach her that your hands and voice predict good things.
Introductions and setbacks are part of the curve
If there are resident animals, introductions belong in this middle phase and should be staged: scent swapping on bedding first, feeding either side of a closed door, then short supervised sight of each other before any free contact. Expect setbacks anyway. A cat who was confident on Tuesday may hide all of Thursday after a dropped pan or a visiting toddler, and that regression usually passes in a day or two if you simply return to calm routine. Judging the trend across weeks, rather than any single day, gives you the honest picture of how she is doing.
When settling stalls and you should get help
Book a vet check early in any adoption in any case, and go sooner if she has not eaten for a full day, hides without emerging even at night, stops using the tray, or shows ongoing vomiting, diarrhoea or breathing difficulty. Persistent fear that is not improving at all after several weeks, or aggression that is escalating rather than fading, is also worth professional help: your vet can rule out pain, which hides underneath a great deal of unsettled behaviour, and can point you toward qualified behaviour support if the problem is emotional rather than medical.
Starting from what is already known about her
Guesswork slows everything down, because you cannot tell a normal habit from a new worry if you never knew the habit. KinsLe's Transferrable Profiles let a rescue cat's profile move to her new owner with her history, records and routines intact, so the foods she trusts, the hiding style she prefers and the handling she dislikes are known from day one instead of discovered by trial and error.