Exactly! This falls under the part of the Constitution that gives all things to the individual States that are not enumerated in that document. And, State’s flags are not enumerated in the Constitution, my Constitution that I read, at least.
It was wrong of journalists to press the governor on the flag when she was trying to reassure people and bring them together, but when things like this happen, people are going to comment on them and use what happened to promote their own agenda.