I suspect that he meant he was aware of her strategic use of her own extensive bag of tricks, but by the end the whole was greater than the sum of the parts. Or something. "Calculated" and "seamless," while not technically at odds, feels grudging.
A friend of mine, one I respect, used to say something like this about Lansbury's Lovett. He'd say, "I can always see her working up there." I'd counter, "Or maybe you see Mrs. Lovett working, since she's scheming almost every moment." I still think I'm right. And like Mrs. Lovett, Mrs. Levi works hard to make a whole lot happen on this one day. Some of her effort -- not necessarily the actor's -- should show. That's part of the fun.