My birthday is the 27th of December and my son's is the 28th. It makes for a very busy Christmas week for us. I've contemplated the 1/2 birthday idea for my son, simply because he really really wants "his party" and definitely will do it next year :)
Unfortunately, being 20 weeks pregnant and exhausted the thought of throwing a party this year is really in the cards for us. So we will do family parties with the grandparents, since we already had a trip set up to visit some relatives in LA in two weeks, we will be celebrating his 4th at Knotts Berry farm. I will also be bringing cupcakes to preschool the week of the 20th so he can have a 'party' with his "friends", he's so excited. In all honesty its the little things that make the kiddos happy.
As a kid I really didn't like the attention or all the parties for me it was just acknowledgement that my birthday was separate from christmas--that means no joint gifts and my birthday presents were wrapped in birthday wrapping paper and Christmas presents in holiday paper. that's all I needed.
I say your plan for you daughters birthday this year sounds great!!