Can we block an employee’s return from FMLA leave?

Q: “I have an employee who went out on FMLA leave for surgery. She just had her two-week follow-up appointment, and the doctor suggested that she stay out for another month. The employee told the doctor it would drive her crazy to be home for four more weeks, so the doctor went ahead and wrote that she would be able to return to work in one week instead of four. Are we as a company legally able to ask the employee not to return until she has had her four-week re-evaluation?” – Jeanet, Colorado