Second Mirrorless Camera In Our Bag?

Welcome! If she gets a NEX, then you will be able to share lenses. That said, I would indeed get the EM5 over the NEX7. IQ is very close, but the EM5 is fully weather-sealed and has an internal image stabilization system that is top notch. I like the fact that the m43 lens system is more complete than the NEXs at present.

Look at it this way, if she gets an EM5, you both can directly compare both cameras against each other. I think it is fun since both systems have their pros and cons.