No, I wouldn't. That's probably within the margin of error for the test. And it's a single test result that fits the current circumstances.
For future reference, the absolute value is more important than the % when looking at the WBC differentials.
Hang in there Mom. The first couple years after diagnosis can be hard, lots of trial and error until things settle down. Keep in mind this is a long haul and you need to keep some energy reserves for future use.