Try creating a stereo or quadraphonic set up — two or four microphones, and then two or four speakers connected to the respective pickup sources outside. Place the output speakers in the corners of the room where she spends most of her time. For ambient sounds, instead of using microphones use six-inch or eight-inch speakers as pickups. Place a light layer of foam behind the protective grill to dampen wind noise. Get an inexpensive pre-amp/mixing board to adjust the balance of each out put until it sounds like it should.
Your setup sounds ideal. Don’t I need some kind of amplifier connection the mics and speakers ? Can you connect the microphones directly to box speakers ?