i am sorry that you had a bad experience. your baby is scared of the clipper. most are. you can try to practice some at home with her. show her the clipper, let her sniff it and touch it (make sure she can not be hurt by it) give her treats. you need to do this slowly and be patient. once she is used to seeing the clipper and is not afraid of it. you can turn the clipper on for a little bit, turn if off. and give her a treat. repeat a couple of times. and gradually increase the time you have the clipper turn on.
hope this helps.