Manager issues

I Started with my company 3 years ago as an LOA specialist. I was then promoted and was always giving autonomy to make decisions and revamp processes where I saw fit. We then decided to outsource and that's when my new boss was hired on. She wanted to fully transition me to benefits bc she felt there was no need to handle LOA since we had a 3rd party. I told her from the start i still feel we will need to manage the relationship and work closely with our 5 HR sites on everything. She disagreed. I was happy for the opportunity to learn about benefits but shortly after I started I gave birth and went on mat leave for 4 months. I came back and was expected to know everything benefits. I had zero training and was expected to look at SOPs and figure it out. A year later I'm feeling more comfortable but that's not why I'm posting. Everything you've read so far is just the tip of the iceberg. My boss is a mean girl. She always has been since she started and no one likes her. I was always on her good side but as of lately I haven't been. The other problem is my coworker too. I found out my boss called my coworker one day when I had covid. It was our in office week and I got covid and told her I had it and would be working remote. She said ok thanks for telling me. Not, ok feel better or keep me posted on how you're feeling. Instead, she calls my coworker to bitch that I didn't go in and "covid guidelines don't even have any restrictions anymore". Ever since I found that out I cannot trust her. Why is she calling my coworker about me?! That is so unprofessional. She doesn't know I know. Things have continued to escalate and I notice she doesn't even look for my input in meetings or give me updates and goes straight to my coworker. It's made me so uncomfortable and that she doesn't want me on her team. She also told me months ago she was ok with my doing local AE meetings bc I have little kids. Then last week tells me she's sending me to CA. Which is the most difficult location to get to bc you have to rent a car and drive over an hour to get there. I had told her previously i don't drive much and she still is sending me. I'll do it but the sudden switch makes me feel uncomfortable. I love the company but also feel I can't find another job bc I have so little experience in benefits. Idk how much more I can handle. Please help with any advice!