If she has the 630, I would prefer purchasing the embroidery module. For around the same(probably less) $$, she will have the ability to embroider without having to use the computer for power (as in the Auroras), she will have the option of different hoop sizes, small hoo, medium hoop, Large Oval and Mega Hoop. She can do basic editing within her machine and have a color screen, the Deco has only the LCD screen. With a basic editing program like Explorations, she can do lots of things with purchased designs and then send the design to the Bernina USB stick...then put the stick in the machine.
HTH
Kim