Should a vegetarian expect special dishes at a dinner party?

My vegetarian friend was complaining that she went to Christmas dinner at a friend’s and her friend, who knew she was vegetarian, did not get it right. She said ham and turkey were served as well as sweet potatoes, mashed potatoes and many vegetables. I did not question her but she seemed to be put out that a specific vegetarian dish was not served. (She was not complaining about the fact that meat was served.) There were a number of other guests at the meal. I lean to vegetarianism myself but It seems to me that if several vegetable options are served at a festive meal, the vegetarian has enough choices and can make do for that meal with what is served. Your thoughts?