Am i justified in hating my mother?

About two years ago, my mother took up photography. Since then, she has grown progressively detached from the "real world". At first, I was happy for her, even if I found photography a pointless hobby. Then, everything became strange. She joined photography websites and began talking about her photos all the time. When we drove somewhere, she'd point out trees and say, "That's my little tree." She'd stare at her computer all night as she painstakingly photoshopped a single image of just random things--grapes posed on a log with boots, crushed eggs and a plunger--all sorts of "artistic" images. Eventually, she stopped cooking. I haven't had a home-cooked meal in over a year. She stopped exercising and working. She just sits at her computer, gulfs down entire pots of pasta for every meal, and complains about the work she doesn't do for a job that she's going to lose soon.
She talks to herself. Outloud. In front of my family and even sometimes in public. She just spews nonsense about how everyone on her photography sites is "the same person" and is "out to get her". Today she went into the laundry room and started yelling to herself about all her inane theories about these perfectly innocent people who suffer from her insanity as she belligerently attacks them online.
She cries all the time. When she's not letting the house grow filthy, she goes into her room and sobs for hours. She cries openly in front of my family too. Today, I came downstairs to find her staring into the kitchen red-nosed and teary-eyed. Before, I would have cared and told her to seek help for depression, but she has literally ruined my family life.
She doesn't talk to my sister anymore, and doesn't ever visit her while the rest of my family goes to see her every weekend.
My father stresses over my mother constantly. It took him a year to realize the extent of her insanity. He only started stressing when she yelled at me in public for sitting in "her" chair--the one by the edge which would allow her to view "stalkers"--at the eating section of the supermarket. She proceeded to sit at another table and tried to ground me.
On a side note, my mother, before she went completely crazy, also alienated my grandparents. She always thought that they hated her and were out to get her. She did this with her coworkers as well and almost got fired for accusing others of stealing her work as well.
Back to the subject, my mother hates me in particular. I was always the unloving child. I was the first to stop appreciating her hobby and the only one to take a direct stand against her. She had on numerous occasions told me "to be nice to your mommy" and called me a bitch. Likewise, I too hate her with all my might. Every moment with her is awkward and disgusting, and she doesn't even realize it. She thinks that nothing has changed since before her photography.
Right now I'm stuck alone in my house with her. We don't talk. So readers, is it normal that I hate her?