Hi Raymond,
Firstly, congratulations to you both on your impending arrival, it's a very exciting time.
Your wife would definitely be entitled to Maternity Benefit as she is working up until the 2 week mark before her due date. She would be entitled to the full 26 weeks payment also but there would be no harm in ringing the Maternity Benefit section of the Welfare Dept just to double-check. She would be legally required to finish up two weeks before her due date regardless of whether she planned to return to work or not.
Hope this helps and best of luck to you.
AnnieC