Okay, in that case, skip tonight. Since it looks like that was accurate, I would say odds are Biskey had a hypo today. Is there any way to get some mid-cycle tests either during the day or before bed? Not tonight since you're skipping the dose, but tomorrow when you have given a shot? The PS numbers don't tell us how the dose is impacting Biskey since usually be the time the PS rolls around, the insulin has worn off.
The other possibility is that she's getting carbs. Is she being fed kibble or a food that is more than 10% carbs? Those can cause erratic numbers too.