Outdoor stretch

Hey growers, I've been strictly an outdoor grower but this Southern Hemisphere season has been a complete stuff up. With no time to get any yield this season I went indoors with CFLs at the start of February with a view to finishing them off outdoors. It's been a success and i germinated another seedling towards the end of February.
Looking nice and squat ,this seedling was put outside at the beginning of last week and as pics show stretched immediately. The weather was humid and overcast during that time, and initially it was given a couple of days in the shade to harden off.
I'm looking at putting my older plant out after our Autumn Solstice and have been slowly adjusting my light cycle down from 18/6 to reach 12/12 around that date. She's also just started showing.
I'm curious as to what has caused the stretching in an outdoor situation? Would it be the overcast weather? Any other advise for the move of the female or with light cycles, etc?

Cheers and thanks

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