Grandma hitting me, need legal advice (NOT QUOTING SOUTH PARK, I'M SERIOUS)?

I'm a 15 year old guy and I live with my uncle (Legal guardian) and my grandmother who is around 75. Earlier today my grandma asked me to help me with her computer, and I agreed to. A few minutes in to me helping her set up a new email, she started getting irritated and she hit me. I said "What the hell Granny?" and somehow (without me laying a finger on her) things progressed to her throwing a cup of coke on the floor, hitting me with a broom, and spraying bleach on me.

What I would like you to answer is the following: (Should I) (and if I do) call the police and they put her in jail, would I be put into child services too? I live in Georgia and I have been in Child services before for a period of 2 years and I would definitely like to live here more. I need help because this is ruining my grades and my whole life, with the turmoil and whatnot.