She is still swimming around and getting into things. Do you think she perhaps just really likes to swim? Or maybe swimming out growing pains?
The water looks fine and her tankmate is as relaxed as ever.

However, it is notable that when I put her in the small, holding tank she is very relaxed and does nothing but sit at the bottom. But when I put her in the 20 gallon it is almost as if she has never been in water before.
Could the change in scenery be causing the endless swimming? She has been doing this before we started fussing with the tank though. My estimate would be maybe five days of near-constant swimming. I guess it is good that she takes the occasional 5-10 break, but I wonder what is distressing her.