This will be emotional for both of you but I have faith that you will adapt well.
Years ago my pseudo-sister (meant nicely!) had two Italian Greyhounds that she was kind enough to loan to me frequently so I could get my doggie fix. They were my starter hounds. The younger one was born deaf. Since she always followed her big sister, that was never a huge issue for her. One year we woke up on December 26 to find that she had gone blind overnight. We were worried about this "poor" girl who was now deaf and blind. What we learned was that we were the ones that worried. Vera, the older IG was always by her side, and Sharky was fine for the years after that she was with us. It is a shock, but you will likely find that it is harder on you than on her. Try to follow her lead. You've got lots of good advice above on how to arrange the house, etc. so I have nothing to add. Just trust yourself and trust Hannah.