@jimmyclear @Robbini If it follows the rule of "last location," then it could potentially be useful when trying to escape while being transported. If she's in a carriage, she literally just needs to pop into her kitchen, wait a little, pop back out and bam, she escaped. Of course, she'd need to time it well and make sure no one sees her leave, or they'll stop the carriage and just wait for her to pop back a few feet behind the carriage to pick her up again. That, and if there are other carriages, then she could get run over the moment she comes back if she's not careful. It would also suck if she suddenly pops back inside an object and dies instantly because her head became fused with the side of a carriage. Teleportation horror story right there.
Alternatively, if it anchors to a moving object, such as the inside of a carriage or a boat, and she can also bring other people with her, then it could be used as a means of transporting more people than normal or ensuring that whoever is being transported is done so safely and without anyone knowing. Let's say a princess needs transported from point a to point b discreetly and safely. Our MC needs only jump in a carriage with the princess, bring the princess into her kitchen space, and enjoy a meal with her while the two of them wait for the carriage, which the kitchen is now connected with, to safely reach it's destination. This, of course, would either require precise timing or some kind of communication between those in the closed space and those driving the carriage so the two of them don't leave the closed space too early or too late, and also assuming that the carriage is in one piece by the end of the ride.
All in all, there is a fair bit of potential for her skill that doesn't necessarily have to do with it being a kitchen. Hell, it might even be useful as a storage for valuables if the items left inside don't disappear due to the space resetting whenever she's done with it. Then there's also the fact that, so long as she has enough points, our MC will never be without a food source. She's literally Jesus, pulling fish, bread, and grape juice out of thin air, only her fish is grilled with seasoning, the bread baked fresh out of the oven, and the juice freshly squeezed.