Yup Fuji cameras have automatic functions, and they will work well enough in daylight applications. In low light you need to take manual control, and in fact in Daylight you are better off using amnual control as well as its better to expose for the highlights and then bring up the shadows in camera or in your RAW editor.
However if you want sharp I would highly recomend using a shutter speed of 1/200 at least, because while you may not be moving your wife might be :
- because it was dark, you probably shot at f/2. The X100's lens is notoriously quite soft at close distance @ f/2
- you focused at close distance, but you didn't engage the "Macro" function so the camera wasn't able to focus properly
- the camera chose a shutter time too long for you to steadily handheld the camera, and what you perceived as a soft image was so due camera micro-shakes (or subject movement) and not because errors in focusing
Try to replicate the shot in better light (daylight), engaging the "Macro" function if needed, stopping down the lens to f/2.8 and selecting a shutter speed of at least 1/60s (and use the ISO to expose properly). This way you'll be able to exclude malfunctions of the camera.
