I've never had to encounter such a problem, because (a) both of the directors that I had almost NEVER went up there and (b) our booth was tremendously large and fit about ninety million people comfortably. As unprofessional as this may sound, we actually had our friends up there during shows, and there were couches, so... well, lets just say those couches got more use out of them than was intended when we put them up there. My suggestion would be to get some headsets or something--we had a comm system installed into the walls when my
theatre was built, but a few headset-ready walkie-talkies aught to do the trick. If that can't be done, then just try to convince her that there's not enough room up there for the three of you--if you're confident enough that you won't need her up there, that is.