Is my Peperomia dying? I got her a week ago and she was fine and healthy but then I noticed her stems were getting weak and her leaves stained so I watered her and it did nothing I dont understand what I did wrong

Is my Peperomia dying? I got her a week ago and she was fine and healthy but then I noticed her stems were getting weak and her leaves stained so I watered her and it did nothing I dont understand what I did wrong

by Different_Ice_3035