First author doesn't want a co-author to read the whole paper First author is a PhD student, as am I. All of the other co-authors are our supervisors. The first author doesn't want me to read the paper, because we are both PhD students and I might plagiarize (?!) her work. Can I report this person for unprofessional conduct to the University committee? Or how should I behave?

More details/Update: My supervisors are having huge issues with this student also because now she doesn't want them as co-authors of other chapters of her PhD. As for me, the supervisors sent me a copy of the manuscript so that I could read it, but she discovered it and overreacted. She submitted that paper to a good journal but didn't keep me in the loop so I had no idea about the reviews until our supervisors told me (again against her will). Now, she doesn't want to acknowledge my contribution for another paper. Because of this latter my supervisors and I decided to collect evidence of her unprofessional conduct in the present and in the past.
There is a golden standard (codified in the Vancouver Recommendations on authorship) that every author individually vouches for the correctness of the entire paper. In other words, you can't ask a co-author to only read and write part of the paper, because they need the whole paper to vouch for its correctness. They wouldn't satisfy the criteria to be allowed to be authors. It also suggests a broken collaboration culture if there isn't even enough trust among co-authors to let each other read everything that's happening in a collaboration.

But beyond that, the idea to not let the co-authors read parts of the paper just doesn't make any sense: A paper is intended to be published, at which point it becomes available to everyone, not just the co-authors.