Warby Parker Sunglasses
Warby Parker is the way to go if you're running out of time. You can upload a photo of your girlfriend to the Warby Parker website, and try on different pairs online to see what looks good on her. You can also visit one of their three New York showrooms. Warby Parker headquarters is located on Lafayette Street. They also have a pop-up shop, called The Annex, in the Meatpacking District till March 31st, and they have a boutique in Williamsburg. If you're still unsure, you can always opt to buy her a Warby Parker gift card.
Warby Parker Sunglasses, $95, at Warby Parker