Caveat: I am not a ProZinc user.
Going from 5 units Humlin N to 1 unit ProZinc seems like a reasonable place to start when switching insulins.
I see that you dropped it to 0.4 units ProZinc after she hit values in the 30s. What I've seen recommended when glucose values below 50 are hit is smaller insulin dose reductions by 1/4 when you are starting with a low dose already. This would result in a dose that is 3/4 of what brought the glucose too low. Maybe stick with the 0.8 you used today for at least 3 days and then run a curve.
Other than the 1 note about vomiting on Chocolate's spreadsheet, you don't mention what is being fed, how much, and when; those factors also will affect the glucose readings. Maybe add a 2nd line below the glucose readings to note food info. Some folks use timed feeders to space out the food so that it synchronizes more with the insulin action.
It looks like maybe it isn't lasting long enough and has little to no carryover on the 12 hour dosing. An alternative is to consider dosing every 8 hours OR to consider an insulin with a known longer duration and carryover such as Lantus or Levemir.