Your overall point holds that there was China's version of due process and plenty of elapsed time between her capture and subsequent execution. Therefore it was not a summary execution. Nowhere close. Moreover, to call this out is not a nitpick, it's an important factual correction of the OP.

However I would nitpick that while summary executions do include those without due process, the defining characteristic is simply speed. If the execution happened uncharacteristically fast compared to typical executions, even if all due process afford to her was followed, then she was still summarily executed.