Have you ever hand milked a Holstein?
Th genetics in this country are high production and wouldn't work very well for once a day milking. Having her trained to lead is good, but I'ld run her with another animal, preferably a cow or steer. They are herd aniamls, if kept by herself, you become the herd.
By limiting the grainn you can limit to a degree her production. But any decent dairy animal is going to put the feed she gets into the bucket. Another drawback to some of the dairy genetics is teat size. hey have been selected/bred for a teat size that works well with a milking machine not hand milking.
Personally, if I was going to have cow for milk, it would be a heavy milking individual from one of the beef breeds.
I have Polled Herefords should I breed her and keep one of the offspring. Will that work as a milk cow?
Will you put her with another cow asap?
dun