There are a variety of reasons why your dog's grooming experience was negative:
1) she was treated roughly and perhaps groomer was very rushed, short tempered with her,
2) she had a bad meeting with an anxious, aggressive dog
3) her new look was laughed at by someone in your family and she's embarrased. I would recommend finding a small, quiet grooming facility and watch how they interact with her. If possible stay for the grooming session if the shop doesn't allow that then find a groomer who will. No matter how different she looks with her new hairdo tell her she's beautiful. Something traumatic has happened - if only our dogs could talk.