Feel free to contact me, email below. I’m in Orange County. If you are up north, I can still give you some help or point you in the right direction. My principal concern is that mold that was once encapsulated in walls was disturbed and became airborne, which would potentially have some adverse health consequences.
Consider that if you report this to the authorities, that they may declare the unit "unfit for human habitation" and decide you cant live there anymore. Best to arrange for somewhere else to live I would think. I don't see any real win by staying in a place where your landlord sucks (wont change) or the environment is potentially toxic. (wont change without making your unit unlivable it seems). I would start looking now, then report it if I need to break my lease. Photos would be a good idea.
You might’ve seen it already, but the link might be helpful re mold treatment under CA law. Fwiw when I rented, the only time I can remember a landlord coming into my apartment without permission was when a fire sprinkler in the unit above mine burst, and they needed immediate access to prevent damage to my bathroom and property inside. Your lease should spell those terms out (unannounced entry, repair responsibilities).
The lawyers on board here can answer further, but speaking as a longtime renter, I would definitely document her actions and get everything in writing. And no, you’re not nuts, but you may need someone who specializes in landlord-tenant law.