I agree with the banding, as long as you can find both "beans" and keep both under the band until they fall off, you're good. I've never had problems with jerseys, just with holsteins, where one bean slips up thru the band and into the abdominal cavity, resulting in a "stag". It sounds like she knows what she is doing. As for the milk, usually once they begin to nibble on solid food they learn to sip water, as they are usually thirsty long before they get their next milk ration. I put the milk in a pail and hang it on the gate so that I don't have to hold the pail while I hold my fingers below the surface of the milk and encourage the calf to suckle my index and middle finger just below the surface of the milk so while suckling, they're slurping. It sometimes takes them a few feedings to get the hand of the slurping without fingers. Once they get it, I walk away once I give them the pail because often they want to play and will head butt the pail if I don't put my fingers in it, but if I walk away, they just drink it. I do have greater difficulty getting jersey calves to drink than I do with any other breed, they seem to be more stubborn. They also do whatever they want it seems. My husband bought me these milk feeders that hang on the fence and have a nipple threaded in the bottom so calves can suckle at will. Some of mine will suck, some prefer to slurp from the top and a few that have learned to "bucket" will get on their knees to reach the nipple and suckle even after "graduating" to bucket. I can't win,so as long as they eat, I no longer care how they do it lol.