She will probably need booster injections if she’s an outdoor cat. You might want to try flea treatment: Frontline every month and Drontal worm tablets every 3 months (mash it up in food if she won’t take it). Vets do have spot-on treatments by prescription only for worms which might be easier. Bob Martin stuff not very good – some cats have problems with their flea collars,and they’re not that good, all round, really.
2 litter trays at least, nice warm bed for her, scratching post, toys and try to give her a mixed diet ie 2 wet pouches and dry food left out all door with water. Also she might need to be spayed (sp?).