could my mother have alzheimer's/dementia or is she just nuts?

she's 63yrs old. a few months ago, she moved in and she is NOT how i remember her. i remember her washing my mouth out with soap because i said "damn" - yet she seems to think it's okay to call my daughter a "f--g spoiled brat" because she was crying for her daddy (he'd just gone home after a visit). then mom said my daughter was "playing me like a harmonica" and was devious and sneaky - my daughter at that time was just over 3yrs old.

then she told me my daughter was a princess - an angel! so adorable!

she told me i was a "doormat", letting my daughter "rule the roost" and walk all over me.

she *insists* my daughter wear clothes in the house and will get right mean if my daughter doesn't put on panties - last time i finally blew up and said "why don't you go look in the mirror!?" (because for some reason, my mother has taken to walking around the house in full view of windows and everything stark naked - not at all a pleasant sight). that was different: "i have the right to walk around my own house dressed however i want".

my daughter has problems, one of them being she gets these tantrums that are impossible to stop. all i can do is manage them. she woke up at 3am with a bad case of the runs. i was consoling her on the toilet while she cried because her butt was burning and right in the middle of it all, mom comes in with this stupid chirpy grin and says "hello? gonna be done soon? i have to pee"

i said oh, come on, you gotta be kidding me! can't you go in the sink or the tub or grab a bucket? she's kind of in a situation here.

mom's face went mean and she said "i SAID i have to pee!" so i told my daughter just wait, i'll clean you up, let nana go and you can get right back on. she lost it - crying and screaming that she didn't want to poo on the floor and she was clinging to the toilet and she was getting that wierd glassy look in her eyes right before she flips into mindless hysteria.

the only thing to do is to shock her out of it, so i shouted in my deepest, sternest voice "KNOCK IT OFF!!!"

next thing i know, mom's flying at me, jabbing her finger in my face shrieking "YOU knock it off! YOU knock it off!!!" she ranted on, telling me she was sick of my "abuse", telling me my daughter was "terrified" of me, she wanted me out of the house, and so on. i kept telling her to listen, you don't understand but she wouldn't stop. my daughter was so frightened she fell into the toilet. i bent over to pick her up and mom flew at me and pushed me backward into the tub. i was so shocked i didn't know what to do - i used to be a powerlifter so i was able to hold my bodyweight on just my quads and i pulled myself back up with a hand on the cementboard (i haven't tiled yet).`

i was literally stunned. the only thing i could think was to help my daughter so i bent for her again and i don't know if mom thought the same thing or was coming after me but the only thought in my mind was "get away from me!" and i shoved her shoulders.

now, this is what happened: she stared at me, her face set in a "how dare you!" look, as she tiptoed backward with her arms outstretched. she stopped at the doorframe, clutched it, paused, then sat down. then she lay back. then straightened her legs. then she lay still. i stared at her, bemused, wondering "what was all that about!?" for a few seconds before asking "mom? you okay?"

she said leave me alone.

i looked around the corner and she was lying on the floor. she sat up, looked at me, then put a hand to the side of her head and said "i hit my head on the sink". i looked from her to the sink and back and said "no physical way could you have contacted the sink unless you were two feet taller". she looked around, pointing vaguely, then settled on a mirror that was on the floor tucked under the pedestal sink (waiting to be put up) and now it's the back of her head she hit.

anyhow, my daughter fled the bathroom and when i tried to go after her mom leaped up and confronted me. she wouldn't let me leave and all the time she was screaming at me until finally i blew up and let her have it. when she tried to tell me she was an expert parent, i said "bull - if it wasn't for the dog, my sisters and i would've been dead five times over before we even started school!" (this is god's honest truth and no exaggeration: that dog saved us many times, including from running into the highway, falling into the well, a rooster attack, a cattle stampeded when we snuck into the cow pasture, alerted mom when i was stuck up a very thin sapling and when my sister was impaled through the palm of her hand hanging from a barbed-wire fence - mom's idea of parenting was