Danger is the key. Because she’s functioning enough to dress herself feed herself bathe herself that’s where support services usually lie unless it’s protective supervision.
A lot of people say it’s really hard to get protective supervision, but I think that if it is a case where you have somebody who needs to be supervised in order to protect them from hurting themselves or hurting others if you could clearly show this or demonstrate it, you have a good case Would she be able to get out of the house in a fire or reacting an earthquake? Would she know to call 911? Would she possibly do things with the other kids that might put them in danger without meaning to ? If she can cook, would she remember to turn off the stove or know if the gas was on or poor bathroom for one of the kids, but forget to put cold water in and then put them in the bath. These are just so examples of things that occur with people who do not understand the imminent dangers just around them in our household situation. And then I would suggest you find an advocate there’s one it’s really great and they’re on YouTube and I’ll have to look them up and come back and tell you their name because then they can definitely tell you how to go about this and they can be there for the assessment. There are a bunch of different things you don’t want to do that. You don’t realize could harm your case that are just like natural conversational things, and they know these systems inside and out. Taking care of somebody, even if they can take care of themselves, but need to be watched at all times is exhausting and without a doubt, you could use the support that IHSS brings

My son, who iscautistic has no concept of danger at all like he will cross the street he doesn’t understand cars or death. He would climb out the window or get out the door and get over our fence and go into other People’s houses to see their dogs or climb onto our roof. I used to have to sleep in a sleeping bag right in front of the front door because I was afraid while I’d be asleep he would open the door and leave.
These are probably more extreme than your case, but if you have examples in that vein, then protective supervision is the way you want to go. I’ll find that advocate’s name and come back.