Cats do not object to a friend's home in principle; they object to surprise. A house that arrives all at once, full of new smells, new people and a closed door behind her, is a crisis. The same house introduced in stages, with her own things waiting in the same places every time, becomes a second territory she understands. Trial visits are how you convert one into the other before a long trip forces the question.
Stage One and Two: Exploring, Then Brief Absences
Keep her base identical at every single stage, because the setup is what she learns to trust. Set out her carrier with the door fixed open, her own bedding inside or beside it, her litter tray in the spot it will occupy for the real stay, and her food and water where she will be fed, all in one quiet room rather than spread across the house. On the first visit, simply let her explore that room with you sitting in it, reading or chatting with your friend, and let her choose whether to investigate, watch from the carrier or nap through the whole event. Stay an hour or so, then take her home while the experience is still boring in the best way. On the second visit, repeat the setup exactly, let her settle, then step out of the room, and later out of the house for a short while, leaving her with your friend and her familiar things. A cat who hides through the first visit and eats a treat during the second is progressing exactly as cats do.
Stage Three and Four: A Meal There, Then a Trial Overnight
The third stage adds the ritual that anchors a cat's day: a meal at the friend's home, served by your friend in the usual spot, at the usual sort of time, from her usual food. Eating in a place is a declaration of safety no amount of exploring quite matches, so watch for it as your green light. If she eats calmly and uses the tray, arrange the trial overnight: same room, same base, her night routine followed as closely as your friend can manage, and you reachable but absent. Collect her in the morning and read the evidence honestly: bedding slept in, food eaten, tray used and a cat who greets you normally all say the long stay will work. A cat who has not eaten, has hidden throughout or has been frantic needs another round of the earlier stages, not a braver leap, and there is no shame in switching to a home sitter if the stages stall. If any payment or costs are agreed with your friend for the long stay, confirm those agreed terms in writing before the trip.
Reading Her Signals and Keeping the Gains
Judge each stage by behavior over the whole visit, not the first five minutes, since most cats startle at arrival and settle once the house proves quiet. Note what helped: the room she chose, where she hid before emerging, which of your friend's habits she liked, and pass those details into the written brief for the real stay along with feeding, vet contacts and emergency arrangements. Keep the gap between the last trial and the trip short enough that the house stays familiar, and send her bedding unwashed so her own scent travels with her. By the time the long stay begins, the house, the people, the feeding spot and the night routine should all be second-hand news to her, and a cat re-entering known territory settles in hours rather than days. For that stay, KinsLe's Care Pass lets you hand your friend her daily routine, medication notes and vet details for exactly the dates you are away, and the access closes when you return home.