Betta Fish: I have to put Harper down :(

First picture is when we first got her and second picture is from about a week ago, pretty sure she has the marbling gene or something because her coloring never stopped changing and morphing, I've never had a betta perk up so quickly and drastically. She started bloating and pineconeing three days out of nowhere, she's been in a hospital tank with kanaplex and some aquarium salt for two days now and has only gotten worse. She's my partner's fish and has SO much personality, probably one of the most charismatic bettas I've ever had and so full of energy. I'm so sad to lose her but I know she's suffering 😭