OK, figured it out... Pulled her out this morning and found micro-ticks all over, so small I thought they were fleas
Poor dog just got eaten alive by ticks that I couldn't see on her black skin
Oh well, gave her a good tick bath, continuing with the benadryl for the allergic reaction, and I'm gonna keep her out of the heat till it clears up some.
I've seen my bird dogs come out of the woods before with "tick paralysis", but it was always big ticks. Nasty baby ticks... it's almost as if we get into "nests" of these sometimes. I wonder if I dipped my dogs on a regular basis if it would prevent this from happening in the future...