She is most likely to use a standard QWERTY desktop keyboard.

Why this is the best answer

Because Shelley works at a front desk doing scheduling and other routine office tasks on a desktop computer, she would typically use:

  • A full-size QWERTY keyboard
  • With a number pad on the right (helpful for entering phone numbers, dates, and billing figures)
  • A conventional office/PC keyboard layout rather than a specialized or compact one

Special “dental” or medical keyboards (washable, sealed, etc.) are more common in treatment rooms where infection control is critical, not usually at the administrative scheduling station.