@Kieran ******
Yes, your wife can do the 90 day report for you. OR you can send it via registered/ tracked mail. She will need to bring:
-Copy of all passport pages (up to the latest arrival stamp in the Kingdom or latest visa stamp)
-Copy of arrival/departure card TM. 6 (front and back)
-Previous notifications of staying over 90 days (if any)
-Completely filled in and signed notification form TM. 47