Please advise me to help Beatrice!

I found this little one on the cement yesterday evening, brought her in and gave her some honey water (now I know better and am doing sugar water/syrup), got her set up with a little blanket (piece of old clean t-shirt) to snug into, and put her into the garage for the night (I read inside would be too warm). I got her a little sunshine today, and seems to be doing well, if sluggish.

I'd intended to release her in the sunshine today, but it's still in the high 20s- mid 30s today so I thought to try tomorrow when it's supposed to be in the 40s for at least a few days.

Is that still too cold? We'd been having a very mild winter here in the pacific northwest and it's throwing off animals and plants, but have had some cold snaps. Will she hibernate again or die if I release her? Or should I try to keep her until March or when I see spring flowers blooming?