<human>: Can you give me the gist of the text in a nutshell?

A bit of explanation. In my job I work with a small group of people, about 7 people. We have a coordinator, P, and she has an assistant, T. Recently T seems to have a vendetta against another coworker, J. To be fair, J has had some issues in the past with work, being sloppy and inattentive but he is, in general, a good employee. 

T can be. . . Exhausting, for lack of a better word. When she's working with us she has a habit of constantly talking and trying to get my attention. She also has problems with being professional  in my opinion, talking about bodily functions like a 8th grader. Recently I had an issue with her where I felt I was being berated by her and swore at her. I was diciplined and have been working to avoid confrontation with T. But recently I've had an issue and I don't know what to do about it.

T has recently been constantly complaining about everything J does. For exemple, thus morning J was supposed to be into work at 8 am but didn't get in until 8:30. He called in and had a legitimate reason and the place didn't break down because he was a half hour late. T, who was in for a little bit this morning made a big deal about him being late. I gave her his reason and she seemed to think it was just about him being lazy.

I feel that T is being unfair to J but I'm afraid to bring it up due to my history with her. I've thought about talking to P about it but I'm not sure how it would go over, I don't want to be insubordinate but I feel it needs to be addressed. What should I do?
<bot>: My manager's assistant seems to hate my coworker and finds excuses to talk bad about him. I don't know who to tell.