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Character work is one of my very favorite parts of theatre. If your character doesn't seem to have much of a backstory, go ahead and give her one! It really helps me to just sit down with an open Word document and start writing about my characters life, what I think she went through in the past based on the text, etc. I also find it helpful to make iTunes playlists of songs that remind me of the character or situation or songs that I think the character would listen to or find meaningful. Also, think of ways you can relate to her. Something helpful my acting teacher taught me was not to think of the character as something outside of myself that I have to pretend to be, but think of the character as something that's within you, somewhere. He said, "You are more interesting than the most interesting character ever written," meaning, everything your character is feeling is inside you somewhere. It's just a matter of finding that part of yourself and getting there. I hope that helps :) Good luck!

When I get role that I fined particularly hard to portray I like to give my character a story a sort of history.

But I can imagine her being constantly so her posture would definitely not be good.

I think she would walk slower then usual not grandma slow but not normal pace

I can imagine her with a horse voice due to smoking an her disorder

Why don't you look up the characteristics of chain smokers, people suffering with depression and who have eating disorders.