Well, with all the dissenting opinions, I will definitely remember to post pictures once I get her home and in a real tank. As far as her possibly not being a "her" goes, I can't see the little white dot--but that doesn't mean anything. My vision's so crappy that my glasses and contacts make it impossible for me to see anything that small up close.
She stress stripes very, very easily, too. When I change her water, she looks almost as bad as she did in the cup, but she also settles down very quickly. She also eats like a pig! I'm not over-feeding her, but she gulps down what I give her immediately. So I guess, all in all, Sparrow's an interesting little fish.
I'm also heading back to Walmart later today to see if that poor CT boy is still there (and alive). He might have to live in his cup until I get home on Saturday, but at least it will be a clean cup. Bah. Alternately, I may fill up a bottle with conditioned water and try and refill some of the cups that are there. I can't buy them all, sadly...