Yes, she's been clamping her fins ever she started getting "fat".
About 9-11 days ago, Jimmy (our male platy) has been chasing her around a lot. And always around wherever she goes. They are the only two platys we have, so we though Jimmy wanted to stick around with his own kind. Now, Abigail oftentimes settles to the bottom mostly somewhere hidden. Jimmy doesn't chase her around anymore. Sometimes when she retreats to the bottom, we would suspect she's sick, but her appetite is good. So we also suspect she's just been feeding a lot lately. Are these symptoms good? or (hope not) bad?