Set them up as your front L&R speakers (disconnect L&R, then connect to those speaker terminals). Turn off Audyssey and any and all modes (i.e. Dynamic Anything, Night Mode, whatever). Set up the system as "Pure Direct" or "Stereo" and play music she is familiar with. Start at the 2' height and play with the toe-in, from the speakers pointed directly at each other, to pointed at the opposite farthest seating position, to pointed to the middle chair. Be sure she sits in all the seats for a time, for each position test, as you want to hear if you have a balanced sound in all seating positions. "Speaker in the ear syndrome" is to be avoided at all costs (where while seated closest to one speaker or the other, all you can really hear is that speaker and it's way too loud). Now, lower the speakers 6" and repeat the process. Continue until the speaker's tweeter is at ear height. I figure 4 heights, 3 positions at each height, so 12 test runs ....
If you go through the entire process and have no success, try moving the speakers rearward about a foot and try again (on another day, don't want to burn her out).
Once she has chosen a position, set it up with the fronts and rears to their original connectors, and re-run Audyssey. Live with it for a while. If you like the outcome, you are done. If not, play around some more until you find it's happy place (and yours/hers