My name is XXXXX XXXXX I am a General specialist. My son's Godfather is a Chef and I had a similiar situation in buying a gift that he would use, but needed an out of the box idea. What I did is get him what I have suggested for your office manager. Since she loves to cook and has been to a Culinary School, most chefs like to have or own, their own set of knives. To compliment the knives a nice professional carving set that is in its own case would make an excellent gift. I have found a good brand of professional quality, that I think would make a nice gift for your office manager. You can view the sets here: http://www.cutleryandmore.com/wusthof-classic/hollow-edge-carving-set-walnut-case-p114490---or this one---http://www.cutleryandmore.com/wusthof-culinar-petec/hollow-edge-carving-set-walnut-case-p129034
These sets are within your price range for the gift. You can also peruse the site and see some other sets that are available, but more expensive. Please let me know if this is something that you would want for her.
I also thought about a Top Chef personalized Chef's Coat may be nice: http://www.shopbybravo.com/top-chef-customizable-embroidered-logo-jacket-white/detail.php?p=360727 If these suggestions do not work for you, I can continue to look for some other ideas that may work. Joan