I think that one of good methods to drop a feed is to make your lo distracted and keep her busy around the feed time. You may want to be outside shopping if weather permits or if you have to stay at home, offer her something exciting to play with. Be sure to offer some nutritious snack instead and make it festive so she can think it is fun to be a big kid.
If you are dropping a feed that used to be after a nap and you nursed her first thing, you may want to take her immediately to her high chair and offer food. Don't forget to offer some extra cuddles to make up for lost nursing time.
Avoid places you used to nurse her, like a rocking chair or a particular spot. Since it is Christmas just around the corner, if you are going to have a lot of family around she may be too busy and excited that she won't remember anyway.
Good luck!