A two-day move asks a cat to toilet in a car, sleep in a strange room and do both again the next day. The system that holds it together is separation: travelling time, litter time and overnight time each happen in their own setup, with doors shut at every changeover.
Choose the Stop Method Before Loading the Car
Decide in advance how she will use a tray on the road, because improvising in a lay-by leads to open doors and a frightened cat. The reliable method is a closed-door stop inside the parked car. At each planned stop, with the engine off and every door and window shut, place a small litter tray on a protected area of the car floor, well away from her carrier bedding and food, open the carrier door, and let her step out only within that closed car to use it. When she has finished, guide her back into the carrier, secure its door, and only then open a car door to bag and dispose of the waste.
Use her usual litter type in that tray, even if only a shallow layer, because a familiar smell and feel make her more likely to use it. Carry spare litter, bags, wipes for the tray surround and a sealed container for used litter between bins. If your vehicle instead has a genuinely separate enclosed area where a tray can sit away from bedding during a stop, the same rules apply: the car is parked, the area is closed, and she is never loose in a moving car.
Run Driving Legs and Litter Stops Separately
While the car moves, she stays in her secured carrier with her bedding, positioned so it cannot slide, with a cover if that normally helps her settle. She does not ride loose, she does not sit on a lap and she does not have tray access on the move. Offer water at every stop before or after the litter opportunity, in a bowl she can reach calmly inside the closed car or just inside the carrier door, and keep meals to her usual times with modest portions, since a full stomach on a winding leg helps nobody.
Watch for the signals that she needs a stop brought forward: scratching at the carrier, repeated calling, restlessness after a settled spell or trying to position herself as if to toilet. Answer those with the next safe place to park, not with opening the carrier beside a road. If she refuses the tray at one stop, stay calm, give her a few quiet minutes with the car still closed, and try again at the next stop rather than forcing a longer session; many cats wait for the overnight base, which is one reason that base matters so much.
Keep a simple tally across the two days: when she ate, drank, urinated and passed a stool. On a move, appetite and litter use are strong evidence of how she is coping.
Build the Overnight Base the Same Way Each Night
Set up the overnight room before her carrier is opened in it. Close windows, check doors and any gaps behind furniture, then place her litter tray in one corner, water and food well away from the tray, her bedding in a sheltered spot and a hiding place such as a box with her blanket or the open carrier itself. Only when that base is complete should she come out, in her own time, to explore a single secure room rather than a whole unfamiliar property.
Keep the evening close to home routine: the same food, the same feeding order, a play session if she wants one and quiet time afterwards. In the morning, reverse the sequence: feed her, give her a litter opportunity in the room, return her to the carrier and secure it, then pack the tray last so it stays available until departure. The person setting up your arrival room can work from Care Pass through KinsLe instead, receiving time-boxed access that covers the two move days and then ends.