Too Late
She has just spent the last 2.5 months on the road in Europe so she fucking deserves and NEEDS this break. In fact, it is too little of a break. The Games start on the 28th so if she indeed is making her way to London on the 18th, it even seems a bit early having in mind her whole schedule.
Obviously, sometimes as fans we do get carried away and forget that after all she is a normal human being who has its needs and not a machine for titles and stuff.