She wont sleep!!!

My 3 week old has literally not slept today like at all. She woke up at 645am ate and hung out til like 815am then slept from then til 11am then was awake until 120pm then slept til 3pm then was awake until 9pm every time I laid her down after her feed she would wake up and cry. She Will only sleep when I hold her. I cant do this all day and night.....my back kills for 1 but I have stuff to do. I totally enjoy holding and just loving on her but we have a ton of family coming this weekend for a special occasion and I need to clean my house! How on earth do i get it done???? My mother in law says I trained her to only sleep if im holding her but she slept like clockwork for 3 hours after a feed whether she was in her crib/ swing/ carseat/ or being held. Now all of a sudden she won't go in any of it aside from a car ride as long as the car actually moves.