Sister Wont Stop Suing Me Over Assets

Hi everyone, (This is all occurring in California just to preface) My (50m) dad died in 2019 and he owned a relatively large sum of land and i was his trustee. Well, i guess my sister (65f) was jealous and made my life a living hell by consistently suing me, calling my wife and I’s employers telling them to fire us, threatening to go to our children’s schools etc. so, because of this i gave up my position as trustee and court hired a cpa hoping it will get her to stop. She also has a problem with cpa and sued him as well basically for disagreeing with her. She even told cpa “anything (my name) votes for on any matter, my vote is against my brothers vote” (i saw this in court records.) She wont leave us alone and consistently sues us over untrue non-evidence backed things (all under one case so she is able to drag this out). And my wife and i have to show up to court and pay several thousand dollars just for the lawyer to tell her shes full of shit and has no evidence behind her claims. She keeps dragging this case and thinks she is entitled to the entirity of the selling price of the asset which is say ~15 million. On top of all that, she usually does not have a lawyer and when she loses the court doesnt make her pay for our lawyer. And anytime she did have a lawyer, she would blame her loss on having a bad lawyer and would attempt to reassign the case with a different lawyer. I feel like there has got to be a loophole in all of this - we have been stuck in this battle for five years. Is there anything we could do to get her to leave us alone sooner and be able to split the selling price of the land.