To answer the question you asked, yes the feeding an hour earlier could have caused the 327, but what's really interesting is that the BG dropped back down three hours later (which "shouldn't" have happened). The food would have worn off in 3 hours, but there had to be some insulin at work too. Which means either the shot hadn't worn off, or her pancreas produced a little bit?
The same thing seems to have happened a couple other times. You have a note that says "dinner" at +10 on the 28th. You didn't test then, but her BG two hours later was lower than it was when nadir was supposedly happening at +6. Then the next day, her BG dropped between +11 and +12 by 60 points. I think you have a kitty with a pancreas that is trying to work right.
Here is something to try if you get a PS test that is below 200 where you wouldn't usually shoot insulin (like on the night of the 2nd). Feed her, and take her BG about 60-90 minutes later. It should be higher from eating. Then wait another 60-90 minutes and test her. See if it's lower. That's what you want to see happen. It means her body is trying to regulate itself. If that is happening, then I think it is possible that you could actually adjust her dose down from .4u, and you might be able to influence her BG more effectively with the timing of meals than with tiny doses of insulin.
Carl
Edit to add - another option might be a "sliding scale" where you adjust the dose based on the preshot readings you are getting. For instance:
If BG between 200-250, shoot .2
between 251-325 shoot .4
over 325, shoot .6?
Not specifically that range or those doses, but that's the general idea I'm talking about.