If this is a possibility I would emedietly make a 18hr brew of {3-4 tablespoons worm castings + 1tablespoon Unsulfered blackstrap molasses per 1gallon of water}... and foliar spray her all over 'liberally' with it... and water it in her roots also, and do this for the next bunch of watering, foliar spraying her with a new tea every few days.. getting the underside of the leaves very well also and finding good part of the day where the plant will dry good and fast, not before/at night, or morning dew time etc. considering if it is a fungus disease taken hold dont need to add moisture at moist times and help disease. If it is disease, worm casting microbes will outcompete the availavle micro space and out populate the other bad organism's space. Also there is chitin in worm castings which will help the plant to activate immune response stronger and plant could begin isolating the infection blocking it from feeding and it will die off, and why applying the tea multiple times in a row is benefical (it cannot burn!), it will pack all leaf surfaces with benefical bacteria and fungus taking up all available space and protect the plant.
This is, if it is a fungus/pathogen/disease of some kind. I don't know.
You may have something eating your roots also, now that i think about it.. what those wierd spots on your leaves are.. looks like some kind of rust.. but could be sign of something munching down below.
Just all guess man.... I don;t know.