My 2 month old won't nap unless being held

Michelle
I'm at my wits end! She will sleep in the bassinet at night but for her naps throughout the day she won't fall asleep or stay asleep unless she's being held. She used to be a great sleeper, I don't know what changed! If I put her down to sleep she just cries and fusses, even with a pacifier! 
Please give me your tips!