This is still the wrong attitude you’re taking to everything. You’re still treating this like you have a job and your job is to do your job. Nope, you’ve effectively already been fired, your goal now is to hang on and continue drawing a salary/benefits for as long as you need while you’re still in the state of being fired.
A lot of people at your company would be inconvenienced if you just stopped doing your job? Well, guess what, if you were fired last month, they’d be the same level of inconvenienced and yet somehow they would cope and patch things along and eventually they would figure out how to live without you. You’re going to get fired at some point in the near future and they’re going to have to figure all that stuff anyway. It’s not your job anymore to care about how others are inconvenienced.
There’s a process every company has to go through to fire someone to comply with relevant internal procedures and external labor laws. Your job right now is to simply make it as difficult as possible for them to go through that to cling onto your compensation for as long as possible, while remaining scrupulously professional and avoiding the burning of any bridges with anyone outside of your bosses circle.
One thing I recommend you read up on is the concept of the grey rock. Don’t escalate when they escalate, just check out and remain blandly cheery and outwardly compliant. Your boss is your boss, if they want you to sit in a corner and whistle showtunes all day, just reply with a pleasant of course and when anyone else needs you to do anything else, give an apologetic shrug and say this is outside of your control now.
Another crucial thing I’d advise is that you make sure every possible interaction with your boss has a written record. Try to move as many things to writing as possible and avoid spoken conversations unless absolutely necessary and when you do have to have conversations, “take notes” during the meetings because you want “clarity” and then fwd her the notes you’ve taken at the end of every conversation. Take advantage of the fact that she doesn’t read her email to message her every time and be like, “Per our conversation, here are what I have recorded as the actionable takeaways. Please let me know within 48 hours if there are any major misunderstandings I have gotten from our conversation”. Use the defaults to your advantage to be like, “Well, if you wanted to tell me something different, I gave you the chance”.
The point of writing things down is not in communication with her, it’s building a paper trail that is “objective” and not at the whims of individual memory or interpretation. When someone on another team asks if you can help them with something, you can fwd correspondence to them indicating that at X date, your manager established Y procedure that ties your hands and while you wish it were different, you are unable to go over her head. Grey rock, grey rock, grey rock.
Note that while you’re in the state of being fired now, it’s not inconceivable that you could become unfired. Bullies thrive on weakness and if you put up enough of a fight, the manager might simply conclude you’re too much effort to try and push you around and you might reach a detente where she leaves you alone and you don’t cause any external trouble for her.
But you need to totally change your attitude about why you’re walking into work each day. It was one thing for the entire bulk of your career at this company and now it’s a totally different thing.