Well, stress can trigger real seizures as well.
It sounds like she just may be in a "quiet" period -- she went 4 (?) days without seizures on no meds, then 4 days without seizures on meds, so that's just 2 seizures in a week.
Some of the seizure drugs have a long "half life" -- so the effects stay in the body for awhile -- for instance, Jon is on Diazapam (I HATE that drug), and I believe the half life is 200 hours -- that's what -- about 8 days that it stays in the system, and presumably gives some seizure protection. That might be why it took her until day 5 to have a seizure.
One thing I've started doing is keeping a chart of the number of seizures Jon has (right now we're doing a daily average) comparing that to whatever meds and dose of meds he's on. When Jon started on Diazapam and Zonegran, they did stop the tonic/clonics on a low dose, but they didn't stop the tonics -- in fact, the number of tonics stayed exactly the same. Even when he went to a higher dose, there was no effect (at least no positive effect; negative effects were refusing to eat or drink, manic episodes in the middle of the night, hallucinations, self-harming, etc.).
Then I take that chart to the docs (I do a weekly bar graph), and we discuss alternative approaches that might work better. Jon's pretty much worked his way through most of the meds, so not a lot of options in that regard, so now we're tweaking the Ketogenic diet, and adding in magnesium and fish oil, and actually all that has reduced his seizures from about 16 a week to about 7 a week. Still have a way to go.