Poor Jenny, it definitely sounds weather related to me, too.
Daisy is extremely sensitive to storms (especially thunder & lightning), gunshots, fireworks, etc. I haven't tried rescue remedy, b/c Daisy does ok as long as she's close to me and there is a fan going. However, about 5 y/o when we lived in CA, she was in her chain link kennel (we were out) and a surprise thunder storm came up and she became so frantic that she pulled the chain link away from the poles and she hurt herself on the exposed wires. So now that you know that Jenny gets this upset, like us you'll probaby need to be very careful if you have to leave her alone when a storm might occur. We are fortunate to live where the temps are so mild year around that we can take the dogs with us where ever we go for all but maybe a few days per year, so they just go along and that works for Daisy. That isn't possible for most people though, and it wasn't possible for us when we lived in CA where Daisy had the chain link problem, so you may need to find a very safe spot for her and try the rescue remedy.