Like somebody said above, it'd be hard to guess what brand she's wearing, but print off the picture or remember the color and try to find one like it.
Keep in mind, though, that picking out the right color eyeshadow is very important. Tons of people make the mistake of matching it to their outfit or just picking out colors they think look nice. That's the wrong way to go about it. Be sure to choose colors that go with your skin tone and enhance your eyes instead of hiding them
A trick of the trade to is to buy a white or very light beige eyeshadow to keep handy. Often times eyeshadow will look darker on your eyes and you may need to lighten it, you can do that by mixing a little of the two together or applying a slight amount of the white/beige over the color. Another trick is to buy two shades of the same color, put the lighter one on your eyelid and dab the darker shade along the crease sweeping it
slightly above and out when you reach the outer corner of the eye. After that,swipe a tiny amount of a very light colored shadow (i.e. - the white or light beige mentioned above) along the upper part of your eye (above the crease), it brightens up the eye and especially helps with making small eyes appear larger
I'm getting carried away here...I'll shut up now...