Hi I Need Assistance. I Have Been Dealing With A

Hi I need assistance. I have been dealing with a mother with split personality disorder however also a brain tumour survivor I need advice on how I may be able to avoid her verbally abusing me as she does every time she sees me and most times I haven't said a word. I only say Hi and most times she will ignore me and then at random yell in my face or have really bad mood swings. Please help