Just keep calm and keep her in your lap. Give lots of reassurance to her, talking softly. If you are getting tense with expecting her to do screaming and nipping, she will sence that. If she nips, tell her NO. Oh and do not grab a lot of nail in, their skin grows over the nail and can be painful, start with trimming bit by a bit. Put a little pressure first to see if she will scream, if she is quiet, then trim. This is how you will know where her comfort zone is. I do this with my both dogs and works. Hope it works for you too...