This is a tough one for me. One the one hand, I completely understand why they would want to reward players who play for their country throughout the four years so you don't just show up and get the glory. On the other hand, the requirements seem ridiculous because it is just used as a way to make sure Davis Cup and Fed Cup stay relevant. It really has no relation to whether or not the best players will be selected to play for their country in the Olympics.
The benefit for tennis players is that there is a built in ranking system that can easily be used to determine qualification unlike other sports. They don't really need to gel as a team beforehand and it's also not like Gymnastics or something, where there's no clear way to rank the players (at least not that I know of)
Anyway, I think in the end she should be able to play because there are so many factors that come into play with Davis Cup and Fed Cup. For example, if Gilles hated the coach (which he probably does
), and didn't want to play Davis Cup anymore, I don't think he should be penalized just because of one bad relationship. Or, for example if Andy Roddick didn't want to play Davis Cup these last two years because he's getting older and it wears his body out, I still think he should be able to play the Olympics, particularly because he's represented his country for so many years.