@Sienne and Gabby (GA) Thank you so much for the signature info! I think I got it this time

I just received (today) the AlphaTRAK that I ordered from Chewy and have had much better luck already than with the CVS meter I bought the day before (which errored out about a dozen times with all different reasons). I'm getting comfortable with home testing and will definitely continue doing so. The hardest thing for me was actually getting enough blood to do the test, and the many many MANY errors I got which made me feel terrible for sticking her for no gain. I do also plan to give the Freestyle Libre a chance, as my vet recommended, in order to capture some curves. I'm feeling like I shouldn't have followed my vet's direction of starting her at 2 units twice a day, but I had no context and was obviously very upset at the time (feeling like the world's worst pet parent). George is incredibly vet-averse, and I think her BG was inflated due to extreme stress during our first visit. After the first visit the vet gave me Purina DM wet and dry food and I started feeding her a quarter can of wet and 1/4 cup of dry, split into basically two meals. She's not happy with two meals a day, so I'm going to talk to my vet tomorrow about feeding her four times a day (8am, 12pm, 4pm, 8pm), with a MUCH higher percentage of wet food, based on advice from these fora. Thank you all, again!
If anyone else has advice about the Freestyle - a quick clarification - the thing that is attached to the skin is the "sensor". The "reader" is the device that kinda looks like a meter that you hold up to the sensor to read the BG. I can easily find sensors at local pharmacies, but no one has the full kit that includes the reader. I went to half a dozen pharmacies today and called another dozen, and also reached out to a local friend who is a nutritionist and a diabetes educator, all to no avail. I'm going to call the vet in the morning, as my appointment to have the sensor installed is at 4pm.