I think the most fattening happens in the last three weeks of flower. Don't be concerned too much if the plant is taking long to finish cuz that can often mean, in my opinion, that the plant will be high-yielding. If the plant is gonna give you more, it has to work more. It doesn't have TURBO mode or something, so to get more you need more time for it to finish the job. That's just what makes sense to me though.
Good luck, bud. She looks great btw.