Okay, I have a better idea. Similar to what this guy did...
http://www.kokes.net/projectlonghaul/projectlonghaul.htm
However instead of building in LEDs, all you have to do is embed an RFID into the ring which when near an NFC phone will launch this.
Considering the ring is on her hand at exactly the right spot, it should launch every time she picks up her phone!