The DFW area was hit pretty hard early this morning with storms. Did you see the damage in Plano and Allen on the news. I am not in that area, but was close enough to feel the rock and rolling.
I am on the board of a rescue group in Dallas. We see a lot of anxiety of all kinds. I do not know the ages of your dogs, but sometimes with age one can begin to intimidate another. My favorite dog who passed away was always alpha. When he began to get weak with illness and age, my female started picking on him (when I was away!) - I had to separate them anytime I was not around to monitor. (The dried slobber on his back from her standing over him and not letting him move gave her behavior away and his increasing anxiety).
But, I really think your problem is associated to weather. Dogs can tell days before violent storms arrive. They probably know before the weather man but cannot warn us. Maybe we are in for a rough Spring of storms. Is it possible for you to move her into your room in a (wire) crate with a small blanket. She could sleep near you that way, and also put her in it when you are gone. It gives dogs security. Play the radio or tv when you are gone also.
We have three dogs now. One sleeps on his bed in my office. When it storms he will move down the hall to our room and sleep close to the bed.
Just a thought.

ML