Nute definciency? ...and does it matter? Pictures

Sorry RIU-ers, i've been looking for that leaf picture chart to see what this problem is but can't find it. One of my girls is (i think) two weeks away from harvest, i have flushed her a little bit with water, have i taken something vital away in the process? This was one of the top leaves, the lower leaves are still healthy and green. Picture of the plant it's from is included.
As she is close to harvest, can i get away with leaving this problem or do you think i need to add something? Any help appreciated!

**edit** and sorry for the far from great pics, haven't got my camera so these are from my phone.

Hey CherryBomb,
Ilove here. So based off of the pictures and my own personal experience I would say that you are dealing with a mild infection. It could be fungal or bacterial depending on what plants you have (genetics make all the difference), the relative humidity, airflow, and a number of other factors. If it's a bacterial infection of the roots it would be caused by excess humidity, lower the relative humidity of the room and you would slow a fungal infection as well. Drainage and airflow is key, without looking at the roots, or knowing your genetics, I would assume that either the room or your media, have excess humidity. If humidity is not the problem then I would assume that due to the fact that you are in flowering, your plant's immune system is lowered and is facing a mild fungal infection. You can try to fix this with "products", but that would really be fucked up considering how far you are into flowering. Example: Even though sulfur foliar feeds are generally considered safe, no one in their right mind would choose to smoke extra sulfur. Organics can provide decent protection and even produce a remission, but again this depends on your genetics. Mince or smash some garlic, then soak it in water with baking soda over night. In the morning, STRAIN the mixture, put it in your favorite squirt bottle, and foliar feed every 2-3 days, again depending on genetics and humidity as to how often your roots dry. Discontinue use of this foliar spray during the last week of ripening, and make sure that you do a clean foliar feed of pure water at least 4 days in advance to chop time. Then again maybe none of this will even help. Most plants at this stage in the game are going to act like an Auto flowering plant, and just continue with what they are doing.
Plants get tricky when they know they're on their way out.
Sincerely,
ILove
P.S. Make sure to get more feedback from other people because I don't know everything. And for Athiesmo's sake LOVE YOUR PLANTS!!!

Since its your top leaves, possibly heat burn from your light. Ive done it many times.

Let her finish, what you may need to add I wouldnt want to smoke. She will still blaze.

At least 3 weeks to go. Should be ok just no major prob just let the pot dry more.

Thanks for the responses guys i really didn't want to be adding anything so close to harvest unless it's organic and desperately needed. All advice taken with many thanks!
She's a northern lights auto, popped through the ground on 15th Aug, only started flowering around 20th September so i'm at a bit of a loss as far as how near to completion she is, and in the last week or so her buds have doubled, that's why i was thinking the defiency in the leaves was there, cos she sucked up all the nutes during the rapid growth. I have another identical plant which is frosty as hell and looks about a fortnight more developed....really confusing. Also they are growing side by side but the more advanced one has no discolouration on leaves and just looks far healthier in general.
*Buds - do you think three weeks? I kinda hope so cos she's really bulking up and the more weed the better lol thanks man

i have absolutey nothing to add other than i love your avatar.

Lol thanks Azman appreciate it, yours is cool too

Yes 3 weeks should do it, its the last 1-2 weeks when the main swelling and tightning of the bud occurs.

Awesome, thanks man, i'll take her to the end!