Lather, rinse, repeat, eh? Ugly truth about roller-coasters is that they go up and down, but they always come back around to where they began. The fact that she is sounding more like her old self is good, but it also can be deceptive. I've heard from my MIL that my W was sounding more and more "normal" all the time, but that started months ago.
Maybe when your D gets back you can ask her how things went. How your W and D got along might be a good indicator of what is going on. I know when my D went to Germany for a month with the W, they had a pretty crappy time: they hardly talked, D just wanted to come home, W complained the D was frigid toward her, etc. It seemed to portend that she wouldn't be coming home soon.
Me40 WAW37 M18 T20 S18,14 D13 EA Bomb 6/08 Sep 11/20/08 Ret 08/09 Sep/Filed 11/09