My 2 Month old baby will not sleep by herself!!?

I have a 2 month old baby girl, and she will NOT sleep by herself. She used to sleep on her back in her binett for about an hour or even two, but recently, she wakes up right away, either in my arms, or when I try to set her down. Its getting to the point where she barely takes naps at all during the day. I've tried the car seat, the bouncer, a pacifier and swaddling, any ideas?