Hi,
I do know there is a Private hospital at Gaborone and which supposedly offers a high level of treatment. Your sister could perhaps travel across the border to Johannesburg where there would be far more options available. But if that were the case, I would Only recommend that she went to one of the Private Clinic's in Sandton or Rosebank (or similar).
I have no idea what the cost would be.
Best of luck to you both...Janet
I guess I should have posted the question on medhelp international.