But she won't get to.
To produce milk for humans, a dairy cow must keep giving birth to calves, usually every year. Her calves are normally taken away in the first 24 hours of their life, so that the milk she is producing to feed her newborn can be bottled for human consumption.
This video shows a calf being separated from his mother on the first day of his life. It's clearly distressing for her, it's distressing for him and it may be distressing for you to watch so please give it a miss if you feel you don't need to watch it.