The blurry-ness can be removed with the various Sharpening filters or tool .
To remove the blue color (likely a reflection from the dress), you could do a number of different techniques, like creating a new layer, painting over the area with the correct color, and changing the layer blend mode to something like Hue. Other options include using some of the various adjustments, like Hue/Saturation.
Here's the original (I first lightened the whole picture a bit).
Added a blank layer with Blending Mode of Color.
Used the Color Picker to select a dark brown portion of her hair and painted over the discolored part.
This still seemed a bit light, so I duplicated the layer with a Blend Mode of Multiply and lowered the layer's Opacity..