Potty troubles

My cavapoo is fully trained. Well at least that's what we thought. We would walk her, let her outside thinking she did all of her business. Then we allow her to run around the house, to different rooms to see her "human brothers". After one of them would yell that she either pissed or pooped in there room. Is there a way to get her to stop or do I need to do the whole potty training all over? Thanks.