Awesome! Yes 100% I would be comfortable with them out at 5.5 weeks especially this time of year. (though I realize I was thinking about you being at someone else location) You have plenty of other birds so I don't think she will need heat. She will likely just make friends to snuggle with. I usually have cut the light in the brooder before moving them out completely so it's a little less of an adjustment. But that many birds will put off quite a bit of heat so it shouldn't be a problem.
That's really sweet, my name in Alyssa.
You've got such a cool variety there!