My dog is a year old. We got her when she was 6 months old. We had her potty trained to go outside till we went to my daughters for Christmas. She played with their dog.We went home the next day and now she poops and pees in the house. What's up?

Hmmm. My advice will be to redo the potty training so the dog get permanent memory on that. Just force the dog to be in the area of where you want the dog to pee and take a dump via (collar tied around a tree or fence, or make a little area by making a type of mini fence to keep dog in the certain area you please) on top of that in the process of this. For example if the dog does it again and you catch the dog in the act. Punishment and attention must be given right then and there. So dog knows what he/she is doing is wrong.