I am waiting now for my DIL to bring over her little Pekinese. She will stay with us for 4 days. As much as she misses my son and DIL when they are gone, she still has a great time here too. She enjoys playing with the other dogs and running free in the big back yard. I think she enjoys the attention from someone new too. She can't wait for me to settle down in my chair in the evening so she can snuggle beside me. The others are a little jealous but they like her too.
I am telling you all this so you know not to feel too guilty. Dogs like new experiences and it will be a little vacation for her too. She will miss you tons but she will find ways to enjoy the time. So, go have a great time and buy her an extra Christmas present or two while you are there.