If pregnant employee quits job to have her baby, can she claim FMLA leave and try to return?

Q. Our company has had several employees (who are eligible for FMLA) decline the FMLA leave and provide notice that they are quitting. Often this is due to pregnancy and the employees say they do not intend to return to work after the birth of their child. What happens if the employee changes her mind and decides she would like to return to work within 12 weeks? Are we obligated to honor FMLA or to return the employee to her job? – Mike, Virginia