Look at page 26 of the
manual, if you each do the single headphone thing with the multi-use button, with each headphone/transmitter, does the problem go away? I'm guessing it won't, though, as it looks like they made it very easy to add multiple headphones, even other models, and likely all use the same frequency as a result. Be nice if they had some options on the transmitter for frequency selection, maybe that's something you need to look for if you need to go shopping....
ps Maybe moving the location of her transmitter to make it harder to reach your headphones?
