[BellaYorkie]

Hi all, Bella is now 4 months old and has been doing really well with the house training until this past week when I took her for her first grooming appointment and she has since been having "accidents" all over the house. This is extremely out of character and leads me to believe it is her way of showing how pissed off she is. I am finding poops under the bed, no where near the pee pad, and she will pee right in front of me in some random spot.
I am not exactly sure how to handle this behaviour. I have mostly been catching her in the act. Telling her no, bad girl, ext, and moveing her to the pee pad. I will ignore her for a few minutes and then it is business as usual. I can tell by her reaction that she knows she is wrong, cowers and tail down. Is this the right approuch? Just wait it out? I have restricted her house privilages to one room because I can't trust her anymore. Any thought?