Well, the good news is that you're moving at the best possible time. Others have pointed out that the heat is not too bad in Texas at the time you'll be moving there, and you are moving to Maine at the best possible time of year - the spring can be a bit wet here -- we call it mud season for a reason -- but summer is just WONDERFUL in Maine. 80s all the way and hardly ever have days in the 90s, let alone triple digits. Just thinking about it makes me want to cry - I'm in the middle of a Maine winter and it's NOT nice!
The main point here though, I think, is this: if you don't stress out too much about it, neither will she. I always feel that dogs tune into our moods so much, and if we act like everything is simply running its course and not a big deal, they eventually realize that everything is okay and that the sky isn't going to crash on their heads
Congrats on your impending new arrival, by the way