Is there a government office in CA where I can sit down with someone and discuss how to apply for Medicaid/Medical on behalf of my mother?

My mother moved to Hawaii a few years ago, and is currently living in assisted living there. She was born in CA, and lived her until she was 67-years old, but she has not lived in CA since 1995. I recently moved back to CA, and want to move my mother here too, but she can't afford assisted living here. She has dementia, and I live in a small apartment big enough for one person. She is currently using her savings investments to pay for her assisted living, but when that money runs out I was hoping to apply for Medicaid or medi-cal, so that my mom can receive nursing care near me. She constantly begs me to move her back to CA, but I don't know where to start, or who to talk to. Does she have to live in this county for 6-months before we can apply? Can she get an evaluation exam by her doctor in Hawaii in order to apply in California? Please send me information as to who I can talk to, in person, in order to answer my questions. I do have full power of attorney.