What have I done to her

Week 4, I water till run off. I have given them feed 2 days in a row 500ml per feed only because today is the first day of transitioning into flowering and today's feed had flowering stage nuts. There are a few other plants that have the same symptoms

Looks like over watering, i'd start looking into beneficial bacteria and similar products. Real Growers Recharge works well for root health

eyderbuddy said:

Looks like over watering, i'd start looking into beneficial bacteria and similar products. Real Growers Recharge works well for root health

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I have Canna rhizotonic, would that help? Possibly just misting it onto the leaves?

Let the soil dry out before you water again, should be fine before then

Greendreams94 said:

I have Canna rhizotonic, would that help? Possibly just misting it onto the leaves?

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yup, just follow the instructions on the bottle, you'll be fine!

I also need to get a dehumidifier but am broke as fuck due to Christmas, do the hanging dehumidifiers that are used for clothes wardrobes work?

When transitioning to flower , you would keep a veg feed instead for the first 2 weeks as it will need the extra nitrogen to branch and stretch. After budsites develop and setup , then you can introduce BLOOM FEED.

A common mistake with growers is feeding bloom too early and plant gets leaf fading too early.
It looks way overwatered too.

What are the details of your grow ?

Lights
Temp
Medium
Nutes
Strain ... auto or photo
Cycle

Etc.

Poor drainage and overwatering.

Definitely overwatering, or bad drainage like the above guys have said.
Once I can stick my finger about 3 inches into the soil and feel no moisture, that's when I water.
Definitely need to allow for a wet dry cycle.
Change the watering now, and it should be fine