Beta fish

Hello my beta fish become bigger and 2 days ago she stop interesting in food .yesterday she was staying on bottom under plants and today she’s on top .she’s moving after the time .water is fine I just clean my tank and change water on Sunday .usually she’s waiting for food everyday now she’s stops. it happen after my beta male was moved to quarantine tank and died .he was stuck inside rock hole and damage his fin badly.so I just thinking it’s something can be wrong with my fish .Fin is fine .Belly not big so it’s not swim blender.

Are the 2 photos of the same fish? The 2nd photo looks like a fish struggling to breathe and doesn't have much tail left. I don’t think it will survive much longer and would consider euthanasia using clove oil if it deteriorates further.

Yes it’s the same fish first day and day later .Thank u for your help