7-8mos sounds about right for a good Paraguayan Sativa like I think she is. I don't know about incense ashes, but a small amount probably would not hurt here. The issue to be cognizant of with ashes is that they are very, very alkaline and push pH up very hard, so a small amount is all you really need.
She's showing a need for potassium here, now, too. Fortunately it's relatively easily supplied, the issue is what can you actually get a hold of, and what can you easily transport to the site. Can you get a hold of dried seaweed? If so, crumble it up if it's not already in a meal form, make a 24hr tea with it. Make it very, very concentrated so you don't have to slog so much water up and down the mountain, and use that around the plant, not directly on her roots, but around the edges of her canopy. This will help the plant 'decide' whether or not to take it up.
I'm trying to think of what else might supply a good bit of K... gonna have to give it a thought for a minute.