It isn't looking good.
She's still not eating anything, and now she's resting in all sorts of uncomfortable-looking positions - on her side on the rocks, or upside-down between tank decorations. A couple times I thought she was dead and got ready to scoop her out of the water, but then she...
Oops, thanks for pointing that out. That's a little embarrassing. Here's the picture I meant to link.
I'll try stepping up the water change frequency and see if that helps.
I haven't added any more fish in part because I've been moving around a lot the last few years, but if you think...
I've got a kissing gourami who lives by herself in a 20-gallon tank. For almost two weeks now, she has been perched in a plant near the top of the tank, hardly moving. This is her. Occasionally she's swim to the surface and back down, and if I disturb the plant she's resting in, she'll swim...