Should my mom see a Psychiatrist?

So, there has been this thing going on in my house for quite some time. I am only 17 and my mom WON'T under any circumstances respect my privacy. She watches me out of windows, she follows me around, and makes excuses to bother me (probably because she has nothing better to do since she just sits at home all day. At one point (I will admit, as I cant deny) I got really angry and mumbled under my breath, "I am this close...". So now I see a psychiatrist and for a few months I have been thinking that I was at fault, and this psychiatrist was helping. Well, my mom has been moody for a long time. She has no friends, rarely leaves the house, has no job because she can't work with people, and shuns everything about autism and pharmaceutical companies (she's gotten rid of cable multiple times because she couldn't stand the commercials and will go up to random people and say 'has your baby been poisoned yet?'). It sounds a lot like she's hanging on to her pride, which I at first thought was a good thing. Now I don't. She won't admit or listen to anything. She refuses to listen to anyone else and gets really angry when she can't get her way or no one is on her side. She will deny anything also, like whipping my sister with a belt for some reason. Here comes the worst part. She is a hypocrite. You know, as I said earlier, that I mentioned an indirect threat toward killing her. After being in the 'psyche ward' for a week and undergoing therapy, I hear from her. 'If you ever do that again. I will stab and kill both you and your father' (she was angry at my father for sympathizing with me since I suffer from depression). Of course, even though she tells her sad story of my indirect threat to everybody, neither me or my dad has told anyone of what she has said so far. Later, she got so angry that she screamed that if my Dad ever goes against her again (which he wasn't, he was trying to compromise) she would go for his ostomy bag- his life support that attaches to his colon (or something like that). Everyone in my family agrees she has anger issues but she refuses to see anyone. She hates Psychologists more than she hates Medical Doctors and will literally kill you if you try to force her. We already have the County involved and I'm not sure what to do. Should I tell the County about the threats my mom has made or should I stay silent and try to resolve the issue alone? This is serious so please give your advice~