Perhaps you should look up the meaning of insubordination. MTG does not work for Johnson nor does she take orders from him. He may be the leader but he cannot order her to do anything. She is not being insubordinate but expressing her lack of trust and faith in Johnson doing what is right by Republicans. Johnson has given everything the democrats want while doing nothing for Republicans. Unfortunately, he can do a lot more damage between now and Nov if he remains.
Perhaps you should realize Pres Trump as the presumptive nominee is the leader of the party.