pleeeaase help me ;-;

Idk where really to start. But my mom just lays in bed all day and tells me what to do or goes shopping. That's basically all she does at all. Earlier this summer my little sister was put into the mental hospital because she has a lot of issues. We're both adopted, and our new "mom" doesn't have a husband and her kids moved out so it's just my sister and I with her. I was adopted when I was about 4 and my sister was around 1. We both have severe jealousy issues (I'm not as bad since I lived with our real mom for more of my life), from not being allowed to be around other people or getting hugs as children. Lately my mom and sister have both gotten a lot worse. Our "mom" has been reported several times for both emotional and physical abuse but we never had enough evidence and in Washington (where we've recently moved to- we move a lot cuz mom says it's good for us to change towns/states that often) there's no such thing as emotional abuse and it's only physical abuse if she punches us in the head or uses a weapon against us (that's what the police officer said). My sister has been diagnosed with several mental disorders but the main one is schitzophrenia. She takes Abilify, and it used to help her not have so many psychotic break downs but now it's doing nothing. I can't get her to take her pill anymore, and she won't listen to a word I say no matter how nice and calm I am. She goes wherever she wants and does whatever she wants, she's not even registered in school but I am. I guess I need help as to how to get my sister to be better. All mom does is yell at both of us and guilt trips us for not being happy enough she "rescued" us. So it makes my sister even worse and please don't recommend calling police or anything because every time they come mom pretends to be all responsible and the police say we're just stupid little spoiled brats. Please, any tips on to make my family any better?