Is my female platy underfed or is it a parasite?

[Meylin]

I checked and her poop seemed normal and she's active but she looks like this. If it's a parasite what should i do?

I had separated her there. She was in a 20 gallon tank with other platies and a cory gang

 

[Kyanite14]

She looks fairly normal, but a little droopy. She could be underfed. Do you have live food? I would feed droopy looking pea puffers and killifish live black worms and they would look better in the next few days. Then again they are mostly carnivorous. But I think she could benefit from the extra protein

 

[emeraldking]

Well, she does loo a bit skinny on the belly. It could be a parasite or a worm but she could also be underfed. Try some live food and see if she gets fuller in a week or not.