I'm shocked that no one has recommended the K-50...
Yes the K-3 is the much higher end model, but if it's so your wife can improve the quality of her (non-sport action) shots, I'm really confused as to why this hasn't been brought up. Selling the 70-200 f/2.8 will absolutely finance a DA* 50-135 and a Tamron 17-50 f/2.8. Or skip the 50-135 and go 17-50 + 55-300 WR + DFA 100mm Macro WR.
-Heie
Edit: just seeing that you have Canon FF. Disregard unless you want to jump on a K-3 for yourself, in which case you can continue sharing lenses. "Babe...I'd like to get you a new camera! How's the weather sealed Pentax K-50 sound? Oh, and just a side note, just to ensure we can share lenses together, I got myself a K-3. Don't worry about it, you'll love your K-50"