Yes, a cat can eat beetroot in a small amount: plain, cooked until soft, chopped small, and served as an occasional taste. The raw root is hard and difficult for a cat to chew or digest, so cooking is part of the offer, not a preference. One small piece is the scale. Beetroot is a root vegetable with natural sugars, offered to an obligate carnivore who needs nothing from it, so it stays a novelty beside complete cat food rather than an ingredient in her diet.
Cooking Beetroot Plainly for a Cat
Boil or steam a piece of fresh beetroot until a knife slides through it easily, then let it cool fully before chopping it. Cooling matters twice over: a hot centre can scald a small mouth, and a cooled piece is firmer to cut into tidy, swallowable bits. Serve it exactly as cooked, with nothing dressed over it. Pickled beetroot is out, because the pickling liquid brings vinegar and salt and often other flavourings a cat does not need. Beetroot from a roast tray is out for the same reason once it has cooked alongside seasoned or fatty foods, and beetroot salads with dressing never reach the cat's dish at all. Offer the root itself. This answer is about the cooked root in a small piece, not about juiced beetroot, sweetened beetroot products, or crisps fried from it, each of which changes concentration, salt, or fat beyond the plain taste described here.
The Pink Urine and Stool Question
Beetroot carries an intense red pigment, and in a cat, as in a person, that colour can pass through and tint urine or stool pink or red for a day after eating. By itself, with a cat who is eating, drinking, urinating comfortably, and behaving normally, that tint is the pigment leaving the body and it fades without any action from you. Knowing this in advance is the difference between a calm evening and an unnecessary fright at the litter tray. Keep the distinction sharp, because real blood signs look and behave differently. Contact a vet promptly if you see straining to urinate, repeated small urinations, crying in the tray, visible clots, black tarry stool, repeated vomiting, or a cat who is lethargic, hiding, or off her food, whether or not beetroot was served that day. A cat who cannot pass urine at all needs urgent veterinary help the same day. Pigment explains colour alone; it never explains pain, effort, or illness, and those signs should never be waved away as the beetroot.
Portion, Timing, and the Observation Window
Serve beetroot singly, as the only new food that day, and in a small piece rather than a spoonful piled beside dinner. Then let the next day tell you how it suited her: stool, appetite, and energy all normal means the taste can return occasionally, in the same small amount. Soft stool or a turned-away nose ends the experiment without drama. Because the pigment will colour the tray anyway, a first serving is best timed when you will be home to see the litter tray yourself and can file the pink under expected, rather than leaving a sitter to discover it unexplained. Keep all such extras a small share of the day's intake, and keep a simple note of the serving date so the colour has a documented explanation.
Recording the Serving for the Household
A dated note is unusually valuable with this particular food, because the person who cleans the tray may not be the person who served the beetroot. KinsLe gives that dated serving a visible place through Care Teams, warning whoever cleans the tray tomorrow that pink was predicted and explained in advance.