If she's up at +3 then it's unlikely to be an active cycle. If she has dropped by +3 more than about 10 points, then I'd test again in an hour and then go from there. Not a bad idea to get a couple of tests in on the night cycle no matter what she does when it's the first time shooting that low at night. If you want/need to, you can give her some higher carb food to boost her up before you turn in or if she has dropped at +3.