In the future, if you get a number you're not sure about shooting, stall, don't feed, and then retest about 20 minutes later....by going ahead and feeding her, we don't know if she would have come up on her own (so would know the insulin was wearing off) or if the increase in the number is due to the food you just gave her.
Since she dropped into the 30's yesterday, she definitely needs a reduced dose, but I don't use ProZinc so am not real familiar with it. With her being so low this morning, if you're not able to be with her to monitor, I think I'd skip it ...just call it a furshot
Also, just noticed that you've said you gave 1.8 but your spreadsheet says 2.2....which one is right?