My mother is 73 and is living comfortably off her social security and retirement. She has sold her home and wants me to invest $240,000 for her. It is likely she may need a nursing home in the next 2-4 years as she has a progressive condition.

I have been advised to place 2 years cost of a nursing home into a money market account and place the remaining into a total stock market index fund (50%) and a total bond index fund (50%).

Any other thoughts out there would be greatly appreciated. My primary concern is to have her resources available to her for a nursing home when the need arises and I am wondering if the above scenario is too risky.