Droppy and Yellowing Leafs

I noticed some yellowing about a week ago and fed her a little extra nitrogen a about 4 days ago and she seems to be getting worse. I noticed this morning that the leads were getting quite droopy and I'm not sure that's that's from maybe the heat (got up to 88 at one point) or overwatering.

Anyone see any signs that will pinpoint exactly what's wrong with the girl? Any help is appreciated.

2) Indoors under Mars 1200
3) Water once a week unless needed earlier
4) Dr Earth x Ocean Forest
5) Flowering day 43

It's hard for me to tell from a picture, leaves will usually do that when; a) under watered b) over watered.
^If you feel the leaves themselves and they are light and weightless it could be underwater. If they feel heavy this is a sign of over watering.
As well, you only water once a week? I would suggest watering more often, but with a less amount of water.

The yellowing of some fairly older leaves is considered normal, especially late into flowering. Definitely once you have begun to "flush". In your case, as they seem to be mostly lower, older growth I would conclude it is nothing major. No need to worry

The purple stems can be a sign of cold temperatures, or lack of calcium/magnesium.

looks like that plant has been overwatered for a long time...should give enough water to dry out in 2-3 days. let it dry out 85% and then give it half dose of nutes with cal/mag

Looks like phosphorus deficiency to me.

make sure you water so the soil is saturated, water running out of bottom holes. then stop. giving extra fert really shouldn't be necessary with that soil. exactly what is meant by dr. earth x ocean forest? ocean forest soil with dr. earth fert? this isn't necessary.

Purple and or red stems are completely normal for some strains however, the purple running down the leaf vein is indicative of a phosphorus deficiency. The flacid leaves with the chlorsis are telling you that you are cal mag deficient and some Nitrogen deficiency is also noted. Your choice of containers are too small to support the infrastructure that is required for that plant to be living up to its potential. I use all of ff products in one of my non organic grows at about a 20% reduction in their suggested amounts with exceptional results. Feed them more and maybe a little less watering. These are only MY OPINIONS and I usually get confused real easy