I was thinking Ameraucanas. They come in lavender as will as blue and splash. They lay beautiful blue/green eggs and are smaller birds that don’t seem bothered by the heat here (90s all summer).
Also you mention you have a Marans. These also come in Cuckoo, Blue and Splash and lay dark brown...
Two of mine are also young, a year in August, but she’s dropping feathers right and left. I also thought they didn’t molt this young, I guess she didn’t get the memo 🤣
Sounds like they’ve started their molt which is a yearly thing. One of mine has also randomly started early.
Apparently hens can either make eggs or new feathers but not both. 🤷♀️