Most if not all world class marathoners and distance choose to do a substantial portion of their training 'off road' on trails, grass, dirt roads etc.....this reduces impact stress and injury susceptibility.
Paula probably spends very little (if any) time in Monaco, because the training possibilities there for a distance runner are very limited, with no off road sites close.
Monaco is a tax haven residence, and she can probably convince the tax authorities that Monaco is her 'main residence' in order to lessen the tax burden on her assets. She appears to be a very astute business woman, and with wise investments and compound interest, she will be looking at a substantial portfolio when she retires, in a few years. I don't wish to be negative, but I'm not sure her body will hold up until London, 2012.
ghost