Yellow leaves-So close to harvest

Yeah, it seems normal, as you can see in the photo, it's a nitrogen deficiency, but that's pretty normal. Unless, of course, it's another problem.

I think you have longer to run than you think without seeing your trichs. Your pistols are still white and standing at attention. The yellowing looks to be only on lower branches with older leaves. Pretty normal really. You newer growth looks good.

When she get at end of flowering stage,she get's that "autumn" colors

With two weeks left, this is completely normal. If you've started flushing, it's inevitable. No worries. Just know that her need for nutes has greatly shifted down.