I sense this is going to sink her.
No. It won't cost us anything. And healthcare will become perfect. Read the NYT and listen to ABCCBSNBCCNN.
In reality, she will buy the insurance for poor folks (read medicare and medicaid) and will probably set things up so that middle class and rich folks must go seriously out of pocket to afford plans that are inferior to what they have now. Either that or massive tax increases. There will probably be some attempt to hide the costs by putting the expense on employers. But the details about how she is going to pay for it won't be revealed until after she is president. They will be most unpleasant.
Almost certainly, she will completely centralize control over medical decisions into the federal government. So your knee replacement will wait upon the whims of some minority lesbian bureaucrat in the ministry of health. If that isn't in the initial plan, it will proceed inexorably there as the left struggles to fix a system that will never work and blames everyone but their beloved federal government.