Super...she should be getting pretty close. Take her temperature 2x per day starting right now..normal is 100-102.5 when she drops below 99 she should start labor. :) You can read all about whelping and delivery below. Let me know if you have further questions after you check out this site:
http://www.dogbreedinfo.com/whelping.htm
Good luck and happy holidays :)
breeder/healthcare specialist
15+ years animal health care Hobby breeder of Olde English Mastiffs and owned by an English Bulldog