Yes, I guess you can skip the snack but do test in 30. They say when kitty goes low you need to monitor for two hours after food to make sure they are coming up on their own.
I wanted to say something else. I am not the best person to get advice from. I only had Susie on this site for 10 months before I had to put her down. Do you know how to tag some of the more experienced folks on this site? Please do that in the future because I will not always be around and you need the best advice possible in a situation like this. I'll check on you in 30 minutes. Good luck and remember that you can't assume your Jill will not go lower after +4. They are so unpredictable and you have to always be watchful. Until you get a couple test where she is coming up you really shouldn't take a break. Not today.