Ya know...if she wasn't coned out all over..those scales you saw raised may have just been from her belly being so bloated...the skin/scales have got to go somewhere after a while..they aren't gonna just lay down when her tummy is all pooched out as far as it will go.
She could quite possibly be eggbound...since it is a girl and she is pooing but she's still all bloated and her scales sticking up around her front section. If she is..I'm sorry I have no advice on that except pray....as that doesn't normally turn out so great, I should know..I've lost 2 to it so far. (sorry, I know I'm not helping any by saying that though
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I'm not saying don't treat her with the Maracyn..cas you should, definately. Because constipation can lead to a bacterial infection..which could be causing the columaris, which you definately want to treat.
I would keep the temp lowered and not raise it, more infection will be worse then a little bit of a cold tank, imo.
Have you tried looking in the Frozen food section at the LPS..sometimes they sell frozen Daphnia. And there is another one that they sell that is Daphnia packaged in a gel, it's usually on the regular food isle.
Sometimes they also have frozen veggie treats..for the herbi-fish. You might try that...that will make her poo same as a pea...and chances are she won't realize it's veggies, like with a pea.