Need Urgent Help: Diagnosing Sickness

Love these forums, they've helped me loads in setting up my very first grow - but this is my first post.

I'm a couple of weeks away from harvesting my girls, but one of them has suddenly started to look very sick indeed.

I'm trying to narrow down what is causing this ASAP, so I can harvest her when she's good and ready.

A few weeks ago we went through a heatwave which saw temperatures in my grow-box reach upwards of 40c (104f), which I'm sure didn't help.

I also had to move my 'operation' about a month ago to another location, and I'm thinking that perhaps new water source might be lacking in some of the minerals which where present in the original location (I've been trying to flush her for a week with pure water).

I'm also a little concerned with the new growth, the fan leaves don't look like anything I've seen on any cannabis plant before.

As of today I've started her on a diet of distilled water only, and I'm hoping that it clears up in the next few days.

Anyway any advice would be greatly appreciated for this amateur grower.

looks like you got root rot!!! check your roots for a bad smell. if so its all down hill from her for her..

I had narrowed it down to being a phosphorus issue, but the whole root rot theory did make sense after reading some of the symptoms.

I had a smell of her roots today though and they seem to not smell at all, but she's not drinking as much as she should be.

I'm stumped.

...while not an ideal thing to do, you can upend the plant and pop it out of it's container to get a look at the roots, ...if you have root-rot you'll know it right away.

and check your ph, ...just for shits and giggles.

peace, bozo