I don't know if this is just a coincidence, but I have a similar story at my old workplace.
TL;DR My senior at work hates me 100%, insulted me and made me one of the worst performer. After several years she resigned due to conflicts with the managers, vindicating me.
At that time I was still a junior and only worked there for two months. During this short time there was no trouble and business as usual, but I got information that a new senior will be assigned to our team.
The senior was a conventionally attractive (tall, fair complexion, slim, long haired) woman in her mid twenties. She is also a very ambitious and overachieving person, that she already got a master's degree and able to speak multiple languages. I thought with a senior like her it will increase our team's productivity.
But around one month time since she joined our team, I was starting to get sidelined from tasks and assignments, and often became out of the loop. Every time I tried to talk to her she always answered in short sentences without interest in conversation, and when I called her she does not answer.
Eventually things get worse and she blocked my number, so I totally cannot call or message her. Even my emails are not replied by her. My work performance suffered because I do not know what to do or what my assignments are. Since she was my senior the line of communication was broken. Assignments from the partners and managers were not relayed to me. When at an opportune moment we sit together, I confronted her with questions like why she do this to me? She answered that I am out of line and she cannot deal with me anymore, that I absolutely have no respect for her and so there is no point in her being nice to me, that my work is not done correctly so she has to personally complete my work, that due to my incompetence she is held responsible by the manager, that my work and skills is comparable to highschoolers, and many other things. Since she is the senior people believed her, and I became one of the worst performer and worst reputable person in the entire division under the partners.
Not long after that I got moved to a different team, but we still keep communication through a WhatsApp group. Purpose of this group was for communication inside the team, and even though I have move to a different team I was still in the group to communicate prior outstanding work. At one time she asked me about prior assignments, but somehow after I answered she lost her temper and told me that I talk carelessly, that I need to get in a language class, and she even called me a bitch.
Sometime after that there was another talk about prior work, and again she gets angry. She told me in the WhatsApp group that I am a total trash, that I am jealous of her because she is the senior in charge, that I am an irresponsible person, and she even literally challenged me to a fight! (I'm not making things up, until now I still have the screenshotted conversation).
Finally at other moment there was another questions about my prior work. Again she got angry and told me that I am a nobody to her, that I should take a look in the mirror and she is disgusted by me. In the end she called me irresponsible and she always have to take blame for my mistakes, and then she kicked me out of the WhatsApp group.
I did not care anymore since by this time I was already in another team. Although she really hated me I did not hate her back.
One year passed and I requested to be transferred to a different partners and division to gain more experience. After one month in the new division I hear news that the senior has resigned. I wonder why since she has a great career there. After asking coworkers who are still with her, I received information that she essentially get into a fight with the managers, the fight was bad enough that she cried and handed her resignation letter immediately after the fight.
I was shocked by this, why in just one month since I transferred to a new division she got into a fight with the superiors and resigned? Although it does not matter anymore, this event is a definite proof that she is the one who always instigate conflicts.