How do I remove white background for an image when the object also has white?

Hi,

I am a new user of Photoshop and need help with removing a background and making the object transparent. I am trying to remove the white background for the image below but her dress is very close to white so when I use the selection tool, it selects her whole body. I am also having difficulty creating the background layer. Could someone please tell me how I can do this? Thank you!