Help with camponotus casteanus care?

Hi, I am a first-time ant keeper. I have a camponotus casteanus queen with about 8 nanetics, but there has not been any new hatches in about 1-2 months as far as I can tell. I'm wondering if I'm doing something wrong. They're in a set-up with a test tube, given protein + sugar every few days, but the colony is not growing.

I live in NY where its been getting cold. Do they need to be warm? Are they entering hibernation?

Sorry im such a noob, if anyone has any info for me please send my way! Im very invested in them!