Well I'm not culling 7 orps just because they don't like me sticking my hand under them to collect eggs. Other than that their gentle and sweet, especially the rooster.
Well I'm sure they'll enjoy the outdoors once it warms up and be thankful you kicked them out.
Here is a handy thread
https://www.backyardchickens.com/t/822765/winter-is-coming-checklists-tips-advice-for-a-newbie/870#post_14544841
And a great blog for cold weather chicken keepers...
This thread is still pretty active. I'm in north central British Columbia Canada and my orps have been through -30 (and lower) degrees Celsius... Just the odd day in those temps not consistently that cold... the girls have started to lay, I supplement light about 14 hours a day... The cold...
I'm going to guess she's a cross my girls are just hatchery quality but your lady there looks a lot more slender... less feathers on the feet...
But she might round out and develop more Brahma like characteristics with age I don't know... sure are cute though. :)
Do you have any confirmed roosters? Because sometimes a hen will take there place if there's no roo around... That bird doesn't look like a roo to me... And my orpington rooster has no color is just head to toe buff...
Look for saddle feathers and pointed hackle feathers on the bird you suspect...