I'd start by finding out, somehow, if she is even interested in them. There isn't a single one out there that isn't going to detract from her ear rings. They all look a bit geeky.
As popular as they are, according to the hype, I don't particularly like my Jabra ones. They work great, but I have trouble wih the button arrangement and placement. I have always wanted to try one of the ones that has the buttons on the side so you are pushing into your head, rather then down onto your ear as with the Jabra ones. Unfortunatly I can't justify buying another headset, since I barely use the Jabra.
You see, I mostly use the handsfree in the car, and I got a BT handsfree set installed in my Jeep. It is heaven to have the radio cut off automatically when I place or answer a call. I don't have to do a thing, but get in the car and turn it on for the phone to connect. Maybe you should get her a new car with a factory BT handsfree
I have an older BlueTrek as well and it has the same button problem the Jabra does, and the volume stinks because the speaker doesn't fit in your ear, it just sits outside it.