But she's not too thin any more - just look at the numerous Warsaw pics around. She looks pretty healthy, actually, and has done so since the start of the year.
I actually think her game is different to the game which got her to No 5 in the world - I'm sure I've read somewhere that the mechanics of her groundstrokes have altered substantially for whatever reason. Maybe one of her fans could confirm; certainly they look more awkward, especially the forehand.
Otherwise: not just footwork, but speed full stop. She is far, far too slow and always has been. Wherever her tactical sense went, it needs to return - she did once appear to be able to think her way through matches, but she hasn't been doing this for at least two years. And she definitely needs a shot or several of confidence.