Two weeks is a long time for your daughter to hold a grudge.
I don't know what you did either, but unless your actions/decisions have directly affected her in some way- did you run down the street naked in front of her high school, screaming about the end of the world- then it is time to put a stop to this.
You can only apologize so long, until it becomes an imbalance of power, and suddenly you have a 19 year old in charge of your life- at least emotionally. Would you allow anybody else to do this to you?
Send her an email if she won't talk, and tell her that you will agree to sit and talk to her only once. State a date. Tell her to have her questions ready, and if you decide to answer any of them, you will. Agree to no name calling, yelling, or arguing. This is a one shot deal.
If she refuses to talk with a clear plan in place, then I would carry on as usual. I wouldn't offer the keys to the car so easily, or provide cash for shopping, or do much more of her laundry, or prepare her meals. If she is adult enough to see herself as an 'equal', especially a 'rightful' one, then she is old enough to become an adult too, and act like one.
Go about your business as you always have, put whatever it is you have done, in the past, and realize that you don't owe anybody any explanation as to your own behaviour. If you've screwed up, you need to forgive yourself, and not allow this continued punishment from a teenager.
Short of you murdering her boyfriend, I can't imagine why she would treat you this way, or why you would allow it.