Speedy's were never meant for passengers. And if you have to bring her with, then I'd opt out for the intercom. You'll spend too much time listening to "slow down".
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'05 Speed Triple, M4 Titanium Slip On for Sale - $350
Birdman
I use a Chatterbox when I go on long road trips with a good friend as it allows us to stay in contact when I take off ahead on some twisty stuff or if we get seperated in traffic. It saves a lot of time.
I also use it when I have my 11 yr old daughter on the back of my bikes as it allows me to make sure she is holding on when we take off after stopping at a light.
The unit I have works great it is a GMRSX1. Expensive but worth it to me.