Hi Mary,
I am sorry to say it but – you are getting old.
On the other hand you camera’s focus mode comes preset to ‘closet to the camera subject priority’ which means it focuses on the closest point – in this case Lucy’s nose.
You have two adjustments you can make. The first is to select Single or Continuous Servo. Single is best for static objects and will refocus if the subject moves but Continuous is used for subjects that move more randomly – maybe like Lucy when she is playing. Personally I tend to use Single Servo.
The next important option is the focus area. Many cameras come with a number of Multi Point focus area options. I find the easiest is to choose Single Point and place it in the middle of the viewing screen. Point the indicator at the area you want to be sharp – i.e. the eyes, holds the shutter release button down half way to autofocus, re-compose and shoot.