The fairness test is about her experience, not your intention
A cat does not understand a work trip; she understands that the person, smells, and sounds of her house changed for several nights. Monthly travel can be fair to her if the pattern is predictable, the absences are a few nights rather than weeks, and her home life stays recognisably hers while you are gone. It is not fair if every trip means a carrier, a cattery, unfamiliar animals, and a week of recovery afterwards, repeated twelve times over. Judge the arrangement by adding up her year, not by how guilty or relaxed you feel about any single trip.
Home-based care beats boarding for most cats
Cats bond to territory deeply, so a sitter who comes to your home protects the two things she relies on: her own smells and her own map. Aim for a sitter who stays overnight or visits at least twice daily — not a ten-minute feed-and-leave, but time for litter cleaning, fresh water, a proper play session, and simply being a calm human presence in the room. Use the same sitter repeatedly where you can; a familiar person arriving is a routine, while a parade of strangers is a monthly disturbance. Choose someone she has met while you are home, so the first solo visit is not also a first introduction.
Which cat suits this life
Be honest in your choice at adoption. A confident adult cat with an independent nature, adopted from a rescue that knows her well, will usually absorb regular absences far better than a kitten who needs constant socialisation, a senior with medical routines, or one of the highly people-dependent breeds that shadow their owners room to room. Tell the rescue about your travel plainly; good rescues match for exactly this and would rather steer you to the unbothered three-year-old who sleeps through thunderstorms than place a needy cat in a home that will quietly fail her.
Building the routine she can rely on
Keep her feeding times, litter setup, and evening play in the same shape whether you or the sitter is delivering them, and leave clear written instructions covering food amounts, tray habits, vet details, hiding places, and the behaviours that mean call the vet rather than wait. Set up a camera if you enjoy checking in, leave worn clothing that smells of you in her sleeping spot, and arrange a backup person for the night the sitter's car breaks down. For the first trips keep them short, watch how she eats and greets you on return, and adjust honestly if she shows she is struggling.
Handing over without handing over everything
A sitter needs deep access to one cat's life and no access to the rest of yours. Give them the feeding plan, vet contact, emergency decision you authorise, and house basics in one clear packet that starts when you leave and ends when you return. That temporary, bounded handover is the thinking behind the KinsLe Care Pass, which lets you share a cat's care routine and key details with a trusted sitter only while you are away, so monthly travel runs on preparation rather than hope.