This cow is sick from something, the pasture looks good so I would think that it needs medical attention, not to mention the calf is probably not getting the nutrients it needs from the Mama heifer, and may also get sick from the same thing that is plaqing the heifer. if you do decide to buy it the price is way to high for a 5 yr old jersey in this condition, and if you do be prepared for a very hefty Vet bill, so is it worth it NO NO. I would just drop the whole matter and leave it be, just not worth the trouble.
AL