She is using The QR Code Generator: http://www.the-qrcode-generator.com/
Unitag: http://www.unitaglive.com/qrcode looks like a good site to customize QR codes.
QR Voice is another fun variation to explore: http://qrvoice.net/
Tag My Doc allows you add a QR code to a document, so others can simply scan it. http://www.tagmydoc.com/
Watch how I created and embedded the QR code above.
What could you do with QR codes in your instructional setting? (The topic of immersive technologies in education is a good extension to this conversation.)