HR Creating a Toxic Work Place

I’m exhausted. Please help. I have been at my current job for 3 years now. My Human Resource department has always been the source of my problems ( and others at work). Our HR department is made up of one person, let’s call her P. From the moment I started this job, upper management employees warned me about P, saying she is a terrible person, not someone you want to talk to, and other names that I shouldn’t mention. Despite their comments, I still was kind and civil. P and I did have one issue a year ago where I went to ask the HR department about my sick days / vacation left ( we don’t have an online system) and she gave me a nasty flippant answer that was completely uncalled for. We are not allowed to go into the HR department Monday - Thursday. We are only allowed to go in on Friday, which is also the day P leaves early. We are in the office building and the culture is a toxic one. There is constant gossiping and negative comments made by P. Anytime I leave to go to retail store locations, she questions my moves ( I’m the Marketing Manager and part of my job is to visit store locations to make sure the ship is running smoothly). She also treats one of our IT department employees terribly. She is the HR department and is the very person creating the work drama. Coming into work is the most exhausting and demotivating thing. Last week on Monday I was cleared by the health dept to come back to work. On Thursday, a store manager came into my office to talk ( knowing about my health, because I shared it with him to make sure he was comfortable). Later that afternoon, that same manager shared with me that P said “why would you go into her office after all she has been through. She is still contagious probably” . The next day I wrote a formal complaint about her using my health as water cooler talk and that as HR she should keep my health confidential. Her supervisor told me to leave work and work remotely until this situation was resolved. They called the manager in for a statement and he changed his story in fear of getting in trouble (he told me that and not the people conducting the investigation). That very same day P, who doesn’t know anything going on, goes into the managers office and tell him that another employee ( her supervisor ) has Covid. We have this on video, because my IT department has been helping me since he is fed up with the work place, too. As of yesterday the investigation is closed. She get a measly warning. Nothing more is done. Management sent out an email about the workplace and Covid, but that was the extent. Management also send an email to me offering to mediate a conversation between P and I, however knowing P, I know it won’t be productive. She will act super kind information of upper management and then be vindictive when no one else is looking. I ask that he tell her to not communicate with me unless completely necessary and that I will avoid all conversation with her into the foreseeable future. We are back to square one, because I never talk to her unless I have to anyway. The same toxic work culture. Today I return to work and the secretary, who is close with P Returns the most flippant hi to me while rolling her eyes. Please help. I am exhausted and honestly want to leave. NOT BECAUSE of the job, I love my job. I love everyone else I work with. I want to leave because of the toxic workplace she created. I don’t feel comfortable here. I don’t feel motivated, but I don’t want to move to another office location. I work closely with IT who is right next door to me. I suggested maybe moving her to our other office location close by, but management didn’t entertain that idea. I offered to work remotely, but they want me in the office ( I actually prefer the office so that I can be creative with coworkers). I AM AT A LOSS AND SO EXHAUSTED. Our HR is compromised. The office is toxic. My motivation is almost nonexistent. Edit: One of the owners did say they are looking to outsource her department. Actively. They had a meeting this week. I’m thinking I may be on a “need to know” basis and they may in fact be taking larger measures. P’s supervisor is one of the owners, but she is the only HR employee. Please help me.