I take it she means that traditionally you have the T-giving turkey, Christmas Goose, Easter Ham. There really is no Holiday that is truly associated with some type of beef. Yes I know that individual families have their traditional standing beef rib roast but it's not recognized by the masses. You don't see grocery stores selling a Beef tenderloin for $1.00 a pound as a lost leader to get people into the store because 90% of the country eating it on the specific day. The closest thing that comes to it is New Year's Eve but it has to share the billing with lobster for a Surf and Turf.
Sorry stirblue if your a he not a she, I'm just going by the name