Hello Nick

I don't understand why your mother is paying 11.4%. Surely she has enough equity in her house to simply renegotiate a normal residential/investment loan which would then be very roughly around 7.5% . She could also make it interest only for a number of years. This would mean that she would have to put in about half of what she now has to contribute towards the house. 

Seeing as it was her home and because she lives overseas at the moment she will not have another PPOR in Australia, she can rent out the property for up to 6 years without attracting CGT if she sells. A nice bonus if it's in an area that's likely to grow over the next few years.

If she is planning to come back one day then she will still have her home and not need to buy back into the market at whatever price it will then be. 

Check this with your accountant but I believe that your mother can accumulate the loses and simply use them to offset any gains she makes one day in the future.

Hope this helps  
Elka

P.S. Using wee man as your user name is also not helping your reputation. 
        (Just teasing you)