Outside temps?

It says it's getting down to 57 tonight should I bring my girls inside?

No, if it was going down to 37 degrees then yes. Anything above 40 you're safe.

Have you ever seen those smudge pots they burn in the orange groves on cold nights? If you could get one of those. {jj}

I grew a Spring crop in NW Florida this year. I found out 25F will kill weed. 32F and a heavy frost will touch them up, but not kill them. Light frosts were no issue at all.

Won't even slow them down.

Nah don't bring them in. We had a few nights that were around 50 and even high 40s for a night and my plants didn't miss a beat. You're going to be fine.

Coastal northern California routinely gets down into the upper 40's and low 50s at night throughout the summer and fall and there's no negative impact on the crop, although you wouldn't know it based on the current weather. You don't have any need for concern until the temps dip into the mid-30's or lower.