D.B.
I have a cousin with a major disability (personality disorder, OCD, etc.) and he is unable to live alone for just this reason. He needs more supervision or he'll be in his pajamas all day and never get in the shower because of some fear that someone else used a shower and he'll get some disease. He has to be in a supervised setting.
I agree with you that the yelling doesn't work. I'd tell the dentist that too. Who is footing the bill for all of this? I'd look into a supervised setting through the Dept. of Mental Health or get some help from her physician and/or a disability rights/services organization where you live.
Your daughter is not managing well and is not suited to independent living. She cannot bathe, dress, brush or launder her clothes. She needs more direction, and not from you. You're looking at hygiene but do you even know if she's eating properly? She may need more care than you think. Get a social worker in to evaluate the situation and make recommendations.