I though they where living in India with miles?
Sally and Pippa have been living in Phuket (Thailand) for 5 years (when Sally first left Summer Bay). But Sally and Pippa are in America now for Pippa's treatment only. They will be staying in the States for a long period until Pippa's treatment is over. Sally told Alf that she and Pippa are planning to return to Summer Bay after Pippa's treatment is finished. Since Kate Ritchie isn't returning, my guess is that Sally and Pippa move back to Thailand.
How do we know she is not returning?
Because Kate Ritchie isn't coming back. Kate Ritchie only returned to the show for 2 months. On twitter and facebook, Kate said that Sally won't be returning anytime soon, but you never know in the future, Sally could return in a few years time. From what Kate have said in interviews, she wants to do other things and be "Kate". She has always loves Home & Away and Sally though.
Not anytime soon could mean not in a few months, because even a month can feel like a long time:) what they could do is to bring her back as a guest for a few episodes and have her involved in a accident in a season finale kinda like they did with chloe where she does not survive, that way she can live on not having to hear people say they want her back. Could be in thed 30th anniversary or Alf´s 70th birthday in 2014