Wren is an old friend - she has been with me, trying to find a way to be expressed, for what feels like a long time. I'm glad to see her stepping out into the world.
The trigger "arswren" is optional, and so is directly describing her attributes (copper hair, grey-blue eyes) in the prompt. Pull those tools out of your toolbox if your choice of checkpoint and LoRA stack cause her identity to fade. Otherwise, put her in your scene and go :)
So far she seems to be happiest with GTM's Wowser model, CielBleu, or RawGirl v2 but try your faves and let me know what works.
Happy adventuring!