@Winderdear I think you are going to really really really love your Juin. Doms are the most people-friendly, talkative, calm, adult hens. As youngsters they are extremely peppy but turn into calm loving adults if socialized daily.
Our Dana is very good with our two Silkies -- only at feeding time or treats she can be pushy but not really mean like Cuckoo Marans or Buff Leghorns we've had before. Actually all 3 of our adult Doms were great around Silkies and actually defended one old Silkie from an aggressive Cuckoo in the flock. Our Doms also chased stray cats out of the yard too.
We've had a total of 4 Doms over the years and loved them all. Our Doms never went much beyond 5 lbs so their egg size was in the medium range. Our Dana got up to 7.3 lbs but that was when she had bumblefoot and wasn't exercising or foraging. She's back down to her 5 lb range again now that she's over the bumblefoot episode.
Some breeders may be trying to breed lines of better layers with bigger eggs but I'm afraid that would just change the great personality of our current Doms. Dom pullets have such a beautiful U-shape back and such a variety of pretty rosecombs with leaders at the comb's rear (each with a different comb design that helps me tell the Doms apart). I love the variety and designs of the combs -- some really bumpy while others less so, some leaders hug the skull while others stick straight out in back -- all so different and wonderful.
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Post more pics of Juin as she grows up. They grow up WAY too fast!