Is she dying? Or close to harvest?

Hi folks.

Details:
Bloody Skunk Auto planted in coco coir and perlite, about 3 weeks into her full flowering stage, grown in small outdoor greeenhouse, no extra lights etc.

This plant is one of my first grows, first to bud up, and I just am worried about her. Any thoughts and suggestions welcomed.

Her trichomes don't look ready to harvest but her leaves are getting harder (?), purple and drier. She's getting watered to runoff daily.

Here is her a couple of weeks ago:
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And now, today:
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For comparison, here is another plant (Sweet Nurse) planted at the same time and growing under the same conditions
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Purple is usually an indicator of cold but can also be genetics
I thought that might be it too so I got a greenhouse heater and inkbird temperature controller , then of course as the package arrives today it's warm again!
But I'll hook it up just in case for as the temperature drops.

Though this strain is meant to turn purple I believe, I just thought it would happen sooner.
 
In my experience with outdoor plants when they go dark like that from low temperature they don't die right away but also don't progress much afterwards .

Having now looked into the strain more and finding the Growdiaries website, I think this colouring is just natural for the type.
Here are some other people's photos of the strain.

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