K.M.
Ok usually when they won't lay down its due to ears. Either a she still has a ear infection again or b her ears are being effected by her teeth I am having same issues with son he's had a ear infection for the last three months. Take her back to the dr. Give her Advil or Tylenol for pain . That helps also put two firm pillows in her crib so she sits at a slant like if you was holding her. That helps with him to sleep at least three hrs without me holding him. Good luck