My Mother Is 58 Years Old Started All This In

My mother is 58 years old started all this in last year. Just in last month or two these symptoms are worsen . she has been making lies up and really truly believes them. Is depressed a little more but has brought up a few different times like remarks as if I had been discussing she had just made up inter story she believes this stuff. Losing her mind I have been getting verbally abuses NY my elderly mother on 58 and has never VB treated my like this before. She treats me like I'm her enemy not her daughter. Outta 30 years of my life these past 2years I feel almost as my mom was replaced with a complete stranger . she was always the sweet easy going very easy to love but she ywill now lose or miss place something and immediately accuse me of stealing and later we find it and she makes states like I had discussed some thing with her but never spoken with her at all so that's made up in her head and has been getting worse about forgetting or believing the truth or is hard to get her to agree with what's true and what's false. I see a lot of denial in past 2 years . she's strongly become angry and has been hard to love her or even get along. I have to agree that I'm completely wrong when I'm really right but just to keep her from getting all wigged out snapping and scrgaming. She has only been like this after we lost her mother two years ago and she had demtia herself. We also had a loss of my first born child my mothers first grandchild. So it gets worse right around time a major issue hits in our family. Causing great stress and grief in our family.. She points all her anger, paranoia , depression, anger. All at me her youngest child. Which I know I haven't done anything to cause her to suddenly one day wake up and hate me. I'm concerned more with her is parinoia and aggression towards me and her out look on life. She is very hateful and bitter and I thought first that she just hated me for no reason and wished nothing great for me but pain and suffering. She was a popular woman with her love and her great morals and 100% respectful and she gas always cared what others felt or thought of her. I always wanted to grow up an be just like my momma. She has me worried about her with sudden stories about things that aren't even going on . there made up remarks that only she believes and its been a very new thing that started with her last couple months. She has never been a lier and I can't understand her suddenly start lying this is not her being herself. She goes through the day acting as if Shes just fine and loves everyone and I don't know if she sits and thinks on some thing and she just starts to believe its real. But one second she's good then the one minute her whole outlook changes she gets fired up upset and no one is right but her. She will sometimes cause a really great big argument and makes up this crap that don't need to be talked of in her head. And she tells me the most bitter and hurtful things and I have no choice but to allow this abuse . she really believes these horrible things . I'm not the only one worried about her she has three siblings concerned. This isn't the person I was raised up to love and respect . I honestly am afraid to confide in her .. I can't trust her that she will keep a secret at all. She don't think of how any one else feels at the time she gets her self upset and blood pressure raises and she has one time a year ago pulled a butter knife out on me and my husband during a regular conversation that she suddenly snapped out . outta no where and cops had come. So I fear her when she goes through her mood swings. Like I said example of her normal days recently . most of the day she us normal and she just sent me a random text stating how I needed to stop telling her to not charge me rent. And I reply bk with love and I'm understanding that this really isn't my mother any more so she's automatically right. Even though I know in my heart she is wrong and being very hateful and getting herself upset that I only put up with this abuse because I know that my grandma did this with my aunt few years b4 she had died. So .y mom needs a doctor to get her well. This has caused me so much hurt and confusion with the ongoing abuse I have to put up with if I want to be in her life at all. I need to see a pyhciatrist over the past couple years of nothing but pain and misery.. I need to know what I'm facing from this point on. Because I'm in a situation that I cannot just go up to her and disrespect her by saying I think you have a mental disorder and u have to see the doctor. I was raised with lots of love and respect. I just really figured this out this past week that she has to see a doctor and I should have known along time ago 2 years now that it wasn't normal. I have reasons to believe she has altimzers or demtia.